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.
Keep ownership and updates on one platform
A purchase on one storefront does not normally create ownership on the others. Install from the same account and client used for purchase, and keep that client available for updates and file verification. Moving copied game files between storefront libraries can leave the client unable to confirm ownership or repair the installation.
Before downloading, confirm the store page names IRON NEST: Heavy Turret Simulator, lists the expected Windows platform, and is served from the official Steam, GOG, or Epic domain. Check the address bar before signing in or paying. A search result that offers a standalone installer from another host is not an official alternative merely because it uses the game title or artwork.