Unabel to patch warhammer40k:DOW WA
 

Error: You are attempting to patch the wrong version of
Dawn of War .Please ensure you have installed all patches
between version 1.0 and the current patch versio.

No I am not :)

<lol> Great answer!

Seriously, grab the original, uncracked executable (and other files, if any) from your backup. If you have no backup, well, reinstall the game from the original CD/DVD. If still no luck, contact the game publisher or see the official support forum. This is NOT a general game support forum!