Just add sv_consistency "0" to your autoexec.cfg or config.cfg and that should take care of the problem. It worked for me when I had installed some custom skins.
I think (not sure though) that he has to delete the game from his HD and then download it again in order to get the patches. What I would try first though would be to go here...
RadicaLes Puben #1 [NO AWP]
Ip: puben1.radicales.se:27015
RadicaLes Puben #2 [Dust2 Only]
Ip: puben2.radicales.se:27016
RadicaLes Puben #3 [AWP ON]
Ip: puben3.radicales.se:27015
Located in sweden (northern europe/scandinavia), no downloads, no bad language or spawn camping...
I have been using a skinpack for a while now, but after the latest uppdate I keep getting a message that the is a consistency error in one or more of the models. I´m not able to connect a server or even create my own server for a botmatch because of this error. I have tried validating my game...
You could try this:
In dxdiag click the sound tab and change the hardware acceleration setting to "None" or "Basic". It worked for me and my fps are up around 70 - 100.
Sometimes when I play I get these messages in the console:
Performance warning: Mark bone 'ValveBiped.Bip01_L_Hand' in model 'player/terror.mdl' as being used by bone merge in the .qc!
env_cubemap used on world geometry without rebuilding map. . ignoring: de_piranesi/walltrim01
Failed...