If you're having trouble downloading Sea of Thieves from the Windows 10 Store, there are a few things you can try.
Check the Time/Date on your PC is correct
If your PC's clock is out of sync with the rest of the world, it can cause an error. The best thing is to right-click the Clock on your Desktop and select "Adjust date/time". A new screen will appear with option to set the time and timezones automatically. It's best to turn them both on and restart your machine if needed.
Reset the Windows Store
You can use the steps below to refresh the Store which will clear the cache and refresh your library and permissions.
Step 1: Close the Windows Store app if you have it open.
Step 2: Click Start and type "wsreset", without quotes.
Step 3: Right-Click on the command and click "Run as Administrator". If the Windows permission box appears, click "Yes" or "Run".
Step 4: A black MS Dos screen will appear for a few seconds. Wait for it to disappear and the Store will automatically open.
Step 5: Attempt to install Sea of Thieves
Check for Updates to Windows 10
Always ensure that you have the latest updates to Windows 10 by clicking Start and typing "updates" in the search box. Once you've updated, perform a complete shutdown and restart of your machine.
Get Support from Microsoft
The Sea of Thieves team have very limited access to the Store, and can only provide support in line with the steps above. If you're still struggling with the Store, visit the team at support.microsoft.com who can run through in-depth troubleshooting with you directly.