Playing on a private server (like those for Wrath of the Lich King or Classic ) is the most common goal for players.
Find the realmlist.wtf file in your downloaded game folder (usually in the Data/enUS or Data/ruRU folder). skachat varkraft server
If you want to play alone or with friends on your own machine, you need "repack" software. How do I choose and join a private server? : r/wowservers Playing on a private server (like those for