: There’s no legitimate “offline download” that bypasses Steam. But Steam’s own offline mode gives you exactly what you need—safely, legally, and permanently—for a one-time purchase.
For the best experience, stability, and to avoid viruses, the is the best "top" choice. If you are using a non-steam version, always prioritize downloading the "v34" version as it is the most stable for offline play on older hardware.
Since you are playing offline, you will need bots to play against.