L4D2 server : Invalid host version

[jackoire]

It seems my friends and I l4d2 clients are outdated

Console messages below :

Connecting to public(188.165.206.50:27015)
Sending UDP connect to public IP 188.165.206.50:27015
Invalid host version, expecting 2074, got 2073
BinkOpen( e:\program files (x86)\steam\steamapps\common\left 4 dead 2\left4dead2\media\l4d2_background01.bik )

Anyway to downgrade the server to v2073 ?
Servers running centos.

[CentralFrag]

Sorry I'm not sure if there is a way to downgrade or not. My guess is that you'd have to find the old files else where and replace the ones that got updated.