I haven't found my disks yet, but I have narrowed down their hiding places. We just moved into this house four months ago, and things are still topsy-turvy. Hopefully, I'll be able to experiment tomorrow. I have a v1.3 and a v1.5 disk to try, but from what I remember, they both have this:
which is the opening splash screen, and when you click on "Install", the next screen to pop up will be:
I am reasonably certain my Ubisoft UPlay (now UConnect) version uses the same install routine...
Are you seeing Cyrillic characters after installing a mod?