Install from your library
Sign in to the account that owns the game and open its library entry. Start the installation from that entry so ownership, updates, and file repair remain connected to the correct platform. If the game does not appear, confirm that you are using the purchasing account before reinstalling anything. Store support can resolve entitlement problems more reliably than an unrelated download source.
If installation or launch fails
Restart the store client, confirm that the download completed, and use the platform file-verification or repair option where available. Keep the first troubleshooting pass simple so you can see whether one action fixed the issue. Record the exact error if the problem continues. Contact store or game support with that error instead of replacing official files with files from an unknown mirror.