Steam does offer an offline mode. If you're on a train, don’t have access to the internet, or prefer not to play online, you can enable Steam's offline mode. However, to initially log in and sync your account, you'll need an internet connection. Afterward, you can play games that you've previously logged into and synced with your account offline.
To download and install Dota 2 Offline v1014 using a single link, follow these steps: dota 2 offline v1014 single link link
Limitation: You must be online to start the lobby. Once in-game, no XP, item drops, or battle pass progress is recorded. Steam does offer an offline mode
