i recently modified the pak0.pk3 and replaced the weapons sounds from et to the old ones in rtcw, and i get this error, this means i need to replace it with the one from the installation , or there is some way to avoid this msg? pls help 
could not load official pak files
chris
(chris)
#1
Wils
(Wils)
#2
If you modify the pk3s you’ll fail the pure check and get booted off servers.
You need to either reinstall, or copy the original pk3 over the top if you have it to hand.