How do I fix missing library in Dota 2?

Method 1. Restore Lost Games from Steam Library

1. Open up Steam game player on your device and go to Library.
2. Find the lost game name on the left panel, such as Dota 2, right-click on it and select "Properties".
3. On the Properties window, click "LOCAL FILES" and select "VERIFY INTEGRITY OF GAME FILES…".

Jan 18, 2022