I didn't make it!
The game I bought has Russian text instead of English text, so how do I make it so the text will be in English?
Hm, no way. You have bought Russian edition,which has only Russian .ltx files (dialog texts). Then you cannot choose language during the instalation. Somewhere on the Web might be a patch (or might not be) to overwrite the Russian texts with English ones. But this is very unlikely, because it is always otherwise - first comes the Russian release, and then modders strive to translate it and upload English language patch. Buying the English (International) release is the straight and only solution. Those games are not as expensive as they were at the time of release. Various search and fileshare services might help.