I cant connect to a pure server - " unpure Pk3 client" while Im sure I have pure one.

I setted sv_pure to 0, connected to server, changed again to 1.

It kicks me with " model sarge failed to register " or it lets me play with gamma bug bellow on screens.

Its not client side problem, because Im not the one who got it, tested right now with 2 players on 2 different servers.