Forced Crash

In my server, since auto-update cannot work for me due to CPU problems, I am forced to have manual-updates that my players have to download themselves and self-patch.. I am wondering, is there a way to make a player FORCE-fully crash unless he HAS the CURRENT version the server is in? Cause some people would love to cheat by using the previous version, so all new weapons do not damage them..

IS there a way? Please help, thanks.

Code a .DLL that reads the MD5 of the files off a domain, then compares them to the ones running, have this .DLL autoload when gunz does, and if the MD5's don't match 100% then close the client.

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I can't code c++ or any language, only very minor bit of php.