Make sure you have the SABOW patch files and not the ones for GTOS. GTos ones will not work on SABOW and visa versa.
So you run the 581 exe. That will patch the engine. THen what should happen is the updater pops open. From there using the updater you navigate to where ever you saved the patch too. You might have to mess around using the file type in the updater (I do not remember what its defaults are). Click the patch, a clock appears, hit save and play. Done..
There is no Hooper DLC for SABOW. That is for GTOS. In SAbow that campaign is one of the default ones. Well, its a little different of course. You play as a T62 main battle tanker type guy.
And its these 2 files right? http://graviteam.com/games/SABOW.html?action=downloads
And the unpatched game is in English? That is another potential issue. That is, not being in English or Russian.