Windows Store Fix

This method resolved the problem for me:

1. Disconnect from internet by disattaching the cable or go airplane mode or disable network card.
2. Run an elevated command prompt (Type "cmd" in Search, then press Ctrl+Shift+Enter).
3. Type following commands:

net stop wuauserv
move "c:\Windows\SoftwareDistribution" "c:\Windows\SoftwareDistribution.old"
net start wuauserv

4. Reboot
5. Re-enable internet
6. Try to download something from the Store.

Other methods: https://www.howtogeek.com/249690/how-to-fix-a-stuck-download-in-the-windows-store/
15 Ways to fix store: https://www.guidingtech.com/fix-microsoft-store-not-downloading-apps-games/