Its pointless as people will have to visit external website etc to get that modded stuff, isnt it easier to just ship the mod this way? I have a small idea for you though: small change to a download function that will trigger a error message if player doesnt have the files and you can change the error message to what you want.
PHP Code:
//////////////////////////////////////////////////////////////////////////////////////////////////////
Com_sprintf(errorMessage, sizeof(errorMessage), Cvar_VariableString("sv_downloadMessage"));
MSG_WriteByte(msg, 5);
MSG_WriteShort(msg, 0);
MSG_WriteLong(msg, -1);
MSG_WriteString(msg, errorMessage);
*(int *)(cl + 134248) = 0;
return 0;
//////////////////////////////////////////////////////////////////////////////////////////////////////
Add this after line 1721 in libcod.cpp:
https://github.com/voron00/libcod/bl...bcod.cpp#L1721
And change the cvar sv_downloadMessage to whatev you want.
Ofc this will not trigger if player have the files.