Seeing several complaints about this error in this forum so figured I'd share this info:
MQ2PluginHandler.cpp
Comment out this section as shown and recompile MQ2Main.dll.
MQ2PluginHandler.cpp
//if (mq2mainstamp > checkme((char*)hmod)) {
// char tmpbuff[MAX_PATH];
// sprintf(tmpbuff, "Please recompile %s -- it is out of date with respect to mq2main (%d>%d)", FullFilename, mq2mainstamp, checkme((char*)hmod));
// DebugSpew(tmpbuff);
// MessageBoxA(NULL, tmpbuff, "Plugin Load Failed", MB_OK);
// FreeLibrary(hmod);
// return 0;
//}
Comment out this section as shown and recompile MQ2Main.dll.