Maybe instead of doing all the code for it you could just simply create a sticky'ed thread for mod makes to list the old outdated versions of their mods and have them nominated to be deleted by staff members at their discretion. Just to help clean out the system you know. This way would be simple and keep the developers from having to do any code, plus it wouldn't have to be a regular thing, just check it every month or so kill off a few that are listed in the thread by the mod's creator. You could even pass it off as a Job to Trial GMs just to "test" their dedication to the job. Lmao, simple initiation jobs are always fun for Trials. <3