What type of license do you have? If a commercial license, you will have to contact the Russian distributor for the RU version. If an educational license, then you will have to go to your Account settings on myarchicad.com and complete your registration using a Russian address. I believe that address is how the site determines which version to offer you for a trial or educational license. Not 100% sure though.
One of the forum moderators • AC 26 USA and earlier • macOS Ventura 13.2, iMac Pro 10-Core, Radeon Pro Vega 64