Sorry for replying late. Well, updating was getting me nowhere, and since I haven't got any answers here on forum for few days, I decided it was time to do some manual work.
These are steps how I upgraded the OpenX installation manually:
Downloaded latest Revive 3.0.5.
Uploaded it to new folder on server
Made a clean installation in new DB
Copied old www/images folder to new Revive
Manually copied db records table by table (you'll need some SQL skills here to do it correctly, as you'll probably have same problem as I did with prefixes, OpenX had ox_ and Revive has rv_)
Tested new Revive
Moved old OpenX (it was in a subdomain) and on that spot moved Revive (had to change paths in config file, very important!)
Running Revive 3.0.5 and works great, all statistics, campaigns, zones, advertisers, banners preserved.