Just to clarify something....
v2.50.2x the 64bit version.
v2.50.4x the Win32 version.
His version is NOT over a year old. The definitions are just old.
It seems as though updates are put in
%programfiles%\ESET\updfiles\ - So see about adding those files to your disc. Maybe you won't get the error. Otherwise, you could write a script that checks for an internet connection, if one doesn't exist, then updates get disabled. That would probably work too.
QUOTE (CEoCEo @ Feb 27 2006, 02:54 AM)

I can't find it either... and I dont have any problems with 2.51.20, no message anyway so I'm happy.

You will get an error if you reinstall fresh with no updates. Its definitions simply aren't up-to-date. The release is too old.