Download the client of the desired localization (Russian or English) from the links above.
Using the archiver, extract the folder from the archive.
Note: if the game is unpacked to the system drive (usually C), then the launcher will have to be run as an administrator.
In the unpacked folder, find the Launcher.exe file and run it. Wait for the client update and start playing!
If the game does not start, disable the antivirus and add the game folder to the antivirus exclusions. After that, repeat unpacking the client.