You pay money for a game because you honor the work behind it.
Your issue is with steam and how they handle the german law, not with ritual, ritual put the game only on steam as a last option.
1998 and 1999 that German law did not exist, so you also could get Unreal Tournament (UT99) uncut.
If you feel like making a mod for the game and re-add blood and gore and what so ever, you are free to do so, German Law does not disallow you to do so, but ritual can not do that for you or give you any idea how to do it.
If you want to modify the game, you should use the Half Life 2 sources since that game uses this engine.
Ritual is no longer around, this is a community forum where one helps another if they can, and to maintain a platform containing informations about the games, so it can take a while until someone finds the time to take on your issue.
Getting upset and telling us that you are about to do illegal actions would only force us to report them and turn you in for that - unless I want to support your illegal action, according to German Law the Police could already stand at your door to confiscate your PC.
But since this Website is not located in Germany I'm not forced to report you. So if you could think first before getting emotional on a Website that virtually every one can access that would be appreciated.