I hate mysticdeath.com
I found a copy of mystic deaths infection mod somewhere (dont actually remember where, didnt buy it though), too bad its .amxx and locked to a certain STEAM-ID. (when you try to use it, it somehow checks the STEAM-ID and if wrong, it prints millions of messages in console until the server crashes) I'm posting the decompiled version of it too so you can 'borrow' some of the code.
Have a good day, screw MysticDeath.com.
(MODERATOR WARNING: Do not run .amxx files that do not have source code. Distribution of such files for general purpose use is against forum rules. This case is an exception because it involves reverse engineering.)
A version of zombiemod infection 3.0 with ALL of the known backdoors removed is available here