Put all files inside a clean Zero Hour directory (with no mods installed) and rename Scripts folder to Scripts1 (which is located inside Data folder).
Only one of these files must be inside your Zero Hour directory:
"!Contra008BetaRu.big" - for Russian language.
"!Contra008BetaEn.big" - for English language.
If you want to play other mods at the same time, make a copy of a clean Zero Hour and install 008 Beta in it. 008 Beta will be launched from the new folder. Other mods will be launched from the other folder.

Be aware that this is a BETA release! Bugs and imbalance are likely to be found. We already know about them. Expect them fixed in the final 008 version. We are also aware that some of you don't like the new voices (which are unfinished, though). Sit back and enjoy the BETA. Code, art and balance are subject to change in the future!