Well, if he does that he loses everything and get the modified content warning. Say the Paintball 2 folder is located at c:/games/Paintball 2. extract the zip file into c:/games and then say yes to all to the new stuff. This will give u a perfect b20 without the modified content warning.
-Cusoman
EDIT:
Hi all!
I downloaded the build 20 of the link jitspoe gave us.
Then i extracted it with winrar
and i coppied the extracted folder to my pb2 folder how can i install the build 20 now?
yours sincerely
If you now have a paintball 2 folder inside paintball 2 i suggest deleting the paintball2 folder inside paintball 2 and re un-zipping it in the manner i stated above. If you already did it in the manner stated above than you already have B20 installed.
-Cusoman