diff --git a/dll/dll.cpp b/dll/dll.cpp
index f3b609a3..7d0ed093 100644
--- a/dll/dll.cpp
+++ b/dll/dll.cpp
@@ -19,6 +19,7 @@
 #include "dll/dll.h"
 #include "dll/settings_parser.h"
 #include "dll/client_known_interfaces.h"
+#include "dll/capicmcallback.h"
 
 
 static char old_client[128] = STEAMCLIENT_INTERFACE_VERSION; //"SteamClient017";
@@ -1401,6 +1402,9 @@ STEAMCLIENT_API void Breakpad_SteamWriteMiniDumpUsingExceptionInfoWithBuildId( i
 STEAMCLIENT_API steam_bool Steam_BConnected( HSteamUser hUser, HSteamPipe hSteamPipe )
 {
     PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 5)
+        return 0;
+
     ISteamUser004 *su = reinterpret_cast<ISteamUser004 *>(get_steam_client()->GetISteamUser(hUser, hSteamPipe, "SteamUser004"));
     return su->BConnected();
 }
@@ -1408,6 +1412,9 @@ STEAMCLIENT_API steam_bool Steam_BConnected( HSteamUser hUser, HSteamPipe hSteam
 STEAMCLIENT_API steam_bool Steam_BLoggedOn( HSteamUser hUser, HSteamPipe hSteamPipe )
 {
     PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 5)
+        return 0;
+
     ISteamUser004 *su = reinterpret_cast<ISteamUser004 *>(get_steam_client()->GetISteamUser(hUser, hSteamPipe, "SteamUser004"));
     return su->BLoggedOn();
 }
@@ -1421,24 +1428,28 @@ STEAMCLIENT_API steam_bool Steam_BReleaseSteamPipe( HSteamPipe hSteamPipe )
 STEAMCLIENT_API HSteamUser Steam_ConnectToGlobalUser( HSteamPipe hSteamPipe )
 {
     PRINT_DEBUG_ENTRY();
+    get_steam_client()->steamclient_version = 6;
     return get_steam_client()->ConnectToGlobalUser(hSteamPipe);
 }
 
 STEAMCLIENT_API HSteamUser Steam_CreateGlobalUser( HSteamPipe *phSteamPipe )
 {
     PRINT_DEBUG_ENTRY();
+    get_steam_client()->steamclient_version = 6;
     return get_steam_client()->CreateGlobalUser(phSteamPipe);
 }
 
 STEAMCLIENT_API HSteamUser Steam_CreateLocalUser( HSteamPipe *phSteamPipe, EAccountType eAccountType )
 {
     PRINT_DEBUG_ENTRY();
+    get_steam_client()->steamclient_version = 6;
     return get_steam_client()->CreateLocalUser(phSteamPipe, eAccountType);
 }
 
 STEAMCLIENT_API HSteamPipe Steam_CreateSteamPipe()
 {
     PRINT_DEBUG_ENTRY();
+    get_steam_client()->steamclient_version = 6;
     return get_steam_client()->CreateSteamPipe();
 }
 
@@ -1475,6 +1486,9 @@ STEAMCLIENT_API steam_bool Steam_GSGetSteam2GetEncryptionKeyToSendToNewClient( v
 STEAMCLIENT_API int Steam_GSGetSteamGameConnectToken(HSteamUser hUser, HSteamPipe hSteamPipe, void *pBlob, int cbMaxBlob)
 {
     PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 5)
+        return 0;
+
     ISteamUser004 *su = reinterpret_cast<ISteamUser004 *>(get_steam_client()->GetISteamUser(hUser, hSteamPipe, "SteamUser004"));
     return su->GetSteamGameConnectToken(pBlob, cbMaxBlob);
 }
@@ -1579,6 +1593,9 @@ STEAMCLIENT_API steam_bool Steam_GSUpdateStatus( void *phSteamHandle, int cPlaye
 STEAMCLIENT_API int Steam_InitiateGameConnection( HSteamUser hUser, HSteamPipe hSteamPipe, void *pBlob, int cbMaxBlob, uint64 steamID, int nGameAppID, uint32 unIPServer, uint16 usPortServer, bool bSecure )
 {
     PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 5)
+        return 0;
+
     ISteamUser004 *su = reinterpret_cast<ISteamUser004 *>(get_steam_client()->GetISteamUser(hUser, hSteamPipe, "SteamUser004"));
     return su->InitiateGameConnection(pBlob, cbMaxBlob, steamID, nGameAppID, unIPServer, usPortServer, bSecure);
 }
@@ -1604,6 +1621,9 @@ STEAMCLIENT_API steam_bool Steam_IsKnownInterface( const char *pchVersion )
 STEAMCLIENT_API void Steam_LogOff( HSteamUser hUser, HSteamPipe hSteamPipe )
 {
     PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 5)
+        return;
+
     ISteamUser004 *su = reinterpret_cast<ISteamUser004 *>(get_steam_client()->GetISteamUser(hUser, hSteamPipe, "SteamUser004"));
     su->LogOff();
 }
@@ -1611,6 +1631,9 @@ STEAMCLIENT_API void Steam_LogOff( HSteamUser hUser, HSteamPipe hSteamPipe )
 STEAMCLIENT_API void Steam_LogOn( HSteamUser hUser, HSteamPipe hSteamPipe, uint64 ulSteamID )
 {
     PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 5)
+        return;
+
     ISteamUser004 *su = reinterpret_cast<ISteamUser004 *>(get_steam_client()->GetISteamUser(hUser, hSteamPipe, "SteamUser004"));
     su->LogOn(ulSteamID);
 }
@@ -1642,6 +1665,204 @@ STEAMCLIENT_API void Steam_SetLocalIPBinding( uint32 unIP, uint16 usLocalPort )
 STEAMCLIENT_API void Steam_TerminateGameConnection( HSteamUser hUser, HSteamPipe hSteamPipe, uint32 unIPServer, uint16 usPortServer )
 {
     PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 5)
+        return;
+
     ISteamUser004 *su = reinterpret_cast<ISteamUser004 *>(get_steam_client()->GetISteamUser(hUser, hSteamPipe, "SteamUser004"));
     su->TerminateGameConnection(unIPServer, usPortServer);
 }
+
+// older sdk ----------------------------------------------------------
+STEAMCLIENT_API HSteamUser Steam3_ConnectToGlobalInstance()
+{
+    PRINT_DEBUG_ENTRY();
+    get_steam_client()->steamclient_version = 4;
+    return get_steam_client()->ConnectToGlobalInstance();
+}
+
+STEAMCLIENT_API HSteamUser Steam3_CreateLocalInstance()
+{
+    PRINT_DEBUG_ENTRY();
+    get_steam_client()->steamclient_version = 4;
+    return get_steam_client()->CreateLocalInstance();
+}
+
+STEAMCLIENT_API void Steam3_ReleaseInstance( HSteamUser hUser )
+{
+    PRINT_DEBUG_ENTRY();
+    get_steam_client()->ReleaseInstance(hUser);
+}
+
+STEAMCLIENT_API steam_bool Steam3_BMainLoop( uint64 time, bool unk )
+{
+    PRINT_DEBUG_ENTRY();
+    // Bool argument was dropped in SteamClient003 so just ignore it for compatibility.
+    return get_steam_client()->BMainLoop(time);
+}
+
+STEAMCLIENT_API void Steam3_LogOn( HSteamUser hUser, uint64 steamID )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return;
+
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    CSteamID steam_id_struct(steamID);
+    su->LogOn(&steam_id_struct);
+}
+
+STEAMCLIENT_API void Steam3_LogOff( HSteamUser hUser )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return;
+
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    su->LogOff();
+}
+
+STEAMCLIENT_API steam_bool Steam3_BLoggedOn( HSteamUser hUser )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return 0;
+
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    return su->BLoggedOn();
+}
+
+STEAMCLIENT_API steam_bool Steam3_BConnected( HSteamUser hUser )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return 0;
+
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    return su->BConnected();
+}
+
+STEAMCLIENT_API steam_bool Steam3_GSSendLogonRequest( HSteamUser hUser, uint64 steamID )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return 0;
+
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    CSteamID steam_id_struct(steamID);
+    return su->GSSendLogonRequest(&steam_id_struct);
+}
+
+STEAMCLIENT_API steam_bool Steam3_GSSendDisconnect( HSteamUser hUser, uint64 steamID )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return 0;
+
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    CSteamID steam_id_struct(steamID);
+    return su->GSSendDisconnect(&steam_id_struct);
+}
+
+STEAMCLIENT_API steam_bool Steam3_GSSendStatusResponse( HSteamUser hUser, uint64 steamID, int nSecondsConnected, int nSecondsSinceLast )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return 0;
+
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    CSteamID steam_id_struct(steamID);
+    return su->GSSendStatusResponse(&steam_id_struct, nSecondsConnected, nSecondsSinceLast);
+}
+
+STEAMCLIENT_API steam_bool Steam3_GSSetStatus( HSteamUser hUser, int32 nAppIdServed, uint32 unServerFlags, int cPlayers, int cPlayersMax, int cBotPlayers, int unGamePort, const char *pchServerName, const char *pchGameDir, const char *pchMapName, const char *pchVersion )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version < 2)
+        return 0;
+
+    if (get_steam_client()->steamclient_version < 4) {
+        ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+        return su->GSSetStatus(nAppIdServed, unServerFlags, cPlayers, cPlayersMax, cBotPlayers, unGamePort, pchServerName, pchGameDir, pchMapName, pchVersion);
+    }
+
+    ISteamGameServer001 *gs = reinterpret_cast<ISteamGameServer001 *>(get_steam_client()->GetISteamGameServer(hUser, "SteamGameServer001"));
+    return gs->Obsolete_GSSetStatus(nAppIdServed, unServerFlags, cPlayers, cPlayersMax, cBotPlayers, unGamePort, pchServerName, pchGameDir, pchMapName, pchVersion);
+}
+
+static std::map<HSteamUser, CCAPICMCallBack> capi_cmcallback_map;
+
+STEAMCLIENT_API void Steam3_Init( HSteamUser hUser,
+    OnLogonSuccessFunc func1,
+    OnLogonFailureFunc func2,
+    OnLoggedOffFunc func3,
+    OnBeginLogonRetryFunc func4,
+    HandleVACChallengeFunc func5,
+    GSHandleClientApproveFunc func6,
+    GSHandleClientDenyFunc func7,
+    GSHandleClientKickFunc func8 )
+{
+    PRINT_DEBUG_ENTRY();
+    get_steam_client()->steamclient_version = 2;
+    ISteamUser002 *su = reinterpret_cast<ISteamUser002 *>(get_steam_client()->GetISteamUser(hUser, "SteamUser002"));
+    CCAPICMCallBack new_cmcallback(func1, func2, func3, func4, func5, func6, func7, func8);
+    auto [it, _] = capi_cmcallback_map.insert_or_assign(hUser, new_cmcallback);
+    su->Init(&it->second, nullptr);
+}
+
+STEAMCLIENT_API steam_bool Steam3_GSSendUserConnect( HSteamUser hUser, uint64 steamID, uint32 unIPPublic, uint32 unk )
+{
+    PRINT_DEBUG_ENTRY();
+    ISteamGameServer001 *gs = reinterpret_cast<ISteamGameServer001 *>(get_steam_client()->GetISteamGameServer(hUser, "SteamGameServer001"));
+    return gs->GSSendUserConnect(steamID, unIPPublic, unk);
+}
+
+STEAMCLIENT_API steam_bool Steam3_GSSendUserDisconnect( HSteamUser hUser, uint64 steamID )
+{
+    PRINT_DEBUG_ENTRY();
+    ISteamGameServer001 *gs = reinterpret_cast<ISteamGameServer001 *>(get_steam_client()->GetISteamGameServer(hUser, "SteamGameServer001"));
+    return gs->GSSendUserDisconnect(steamID);
+}
+
+STEAMCLIENT_API steam_bool Steam3_GSSendUserStatusResponse( HSteamUser hUser, uint64 steamID, int nSecondsConnected, int nSecondsSinceLast )
+{
+    PRINT_DEBUG_ENTRY();
+    ISteamGameServer001 *gs = reinterpret_cast<ISteamGameServer001 *>(get_steam_client()->GetISteamGameServer(hUser, "SteamGameServer001"));
+    return gs->GSSendUserStatusResponse(steamID, nSecondsConnected, nSecondsSinceLast);
+}
+
+STEAMCLIENT_API steam_bool Steam3_BGetCallback( HSteamUser hUser, int *piCallback, uint8_t **ppubParam, int *unk )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version != 4)
+        return 0;
+
+    ISteamUser004_old *su = reinterpret_cast<ISteamUser004_old *>(get_steam_client()->GetISteamUser(hUser, "SteamUser004"));
+    return su->BGetCallback(piCallback, ppubParam, unk);
+}
+
+STEAMCLIENT_API void Steam3_FreeLastCallback( HSteamUser hUser )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version != 4)
+        return;
+
+    ISteamUser004_old *su = reinterpret_cast<ISteamUser004_old *>(get_steam_client()->GetISteamUser(hUser, "SteamUser004"));
+    su->FreeLastCallback();
+}
+
+STEAMCLIENT_API int Steam3_GetSteamTicket( HSteamUser hUser, void *pBlob, int cbMaxBlob )
+{
+    PRINT_DEBUG_ENTRY();
+    if (get_steam_client()->steamclient_version != 4)
+        return 0;
+
+    ISteamUser004_old *su = reinterpret_cast<ISteamUser004_old *>(get_steam_client()->GetISteamUser(hUser, "SteamUser004"));
+    return su->GetSteamTicket(pBlob, cbMaxBlob);
+}
+
+STEAMCLIENT_API void Steam3_SetLocalIPBinding( uint32 unIP, uint16 usLocalPort )
+{
+    PRINT_DEBUG_ENTRY();
+    get_steam_client()->SetLocalIPBinding(unIP, usLocalPort);
+}
+// older sdk ----------------------------------------------------------
diff --git a/dll/dll/capicmcallback.h b/dll/dll/capicmcallback.h
new file mode 100644
index 00000000..5a8dd5be
--- /dev/null
+++ b/dll/dll/capicmcallback.h
@@ -0,0 +1,58 @@
+#ifndef __INCLUDED_CAPICMCALLBACK_H__
+#define __INCLUDED_CAPICMCALLBACK_H__
+
+#include "base.h"
+
+typedef void (*OnLogonSuccessFunc)();
+typedef void (*OnLogonFailureFunc)(EResult);
+typedef void (*OnLoggedOffFunc)();
+typedef void (*OnBeginLogonRetryFunc)();
+typedef void (*HandleVACChallengeFunc)(int, void *, int);
+typedef void (*GSHandleClientApproveFunc)(CSteamID *);
+typedef void (*GSHandleClientDenyFunc)(CSteamID *, EDenyReason);
+typedef void (*GSHandleClientKickFunc)(CSteamID *, EDenyReason);
+
+class CCAPICMCallBack : public ICMCallback
+{
+public:
+    CCAPICMCallBack(OnLogonSuccessFunc func1,
+        OnLogonFailureFunc func2,
+        OnLoggedOffFunc func3,
+        OnBeginLogonRetryFunc func4,
+        HandleVACChallengeFunc func5,
+        GSHandleClientApproveFunc func6,
+        GSHandleClientDenyFunc func7,
+        GSHandleClientKickFunc func8)
+    {
+        OnLogonSuccess_ptr = func1;
+        OnLogonFailure_ptr = func2;
+        OnLoggedOff_ptr = func3;
+        OnBeginLogonRetry_ptr = func4;
+        HandleVACChallenge_ptr = func5;
+        GSHandleClientApprove_ptr = func6;
+        GSHandleClientDeny_ptr = func7;
+        GSHandleClientKick_ptr = func8;
+    }
+    ~CCAPICMCallBack() {}
+
+    void OnLogonSuccess() { OnLogonSuccess_ptr(); }
+    void OnLogonFailure(EResult result) { OnLogonFailure_ptr(result); }
+    void OnLoggedOff() { OnLoggedOff_ptr(); }
+    void OnBeginLogonRetry() { OnBeginLogonRetry_ptr(); }
+    void HandleVACChallenge(int unk1, void *unk2, int unk3) { HandleVACChallenge_ptr(unk1, unk2, unk3); }
+    void GSHandleClientApprove(CSteamID *steamID) { GSHandleClientApprove_ptr(steamID); }
+    void GSHandleClientDeny(CSteamID *steamID, EDenyReason reason) { GSHandleClientDeny_ptr(steamID, reason); }
+    void GSHandleClientKick(CSteamID *steamID, EDenyReason reason) { GSHandleClientKick_ptr(steamID, reason); }
+
+private:
+    OnLogonSuccessFunc OnLogonSuccess_ptr{};
+    OnLogonFailureFunc OnLogonFailure_ptr{};
+    OnLoggedOffFunc OnLoggedOff_ptr{};
+    OnBeginLogonRetryFunc OnBeginLogonRetry_ptr{};
+    HandleVACChallengeFunc HandleVACChallenge_ptr{};
+    GSHandleClientApproveFunc GSHandleClientApprove_ptr{};
+    GSHandleClientDenyFunc GSHandleClientDeny_ptr{};
+    GSHandleClientKickFunc GSHandleClientKick_ptr{};
+};
+
+#endif // __INCLUDED_CAPICMCALLBACK_H__