Use this tool by Ratiboris. He is a well known and trusted dev on ru-board who makes this Office installation tool. Use the uninstall feature first to completely remove everything then install whatever version you’d like through the program. After it installs, launch Word once then use the activation tab to activity your installation.
Similar to rutracker, rutor or bakabt. They’re public but you need to sign up to access the torrent files and magnet links.