That's an old AMX(notx) plugin. One of the radius damage functions has changed, so that's where you get the wrong number of parameters. The missing functions are because they are using old function names. If you #include <Vexd_Utilities> then that will provide most of the backwards-compatabilty that you need. That'll still leave you with loose indentations and an out-of-bounds error, most likely. We're not here to do it all for you. :-P
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No longer around. Thanks your support, everyone! As always: