When upgrading Windows if you receive an error code 0XC1900107, then it means cleanup is pending from preview operation. In simple words trace of the previous upgrade is still there. The error message will also include another error video -- MOSETUP_E_CLEANUP_PENDING

A cleanup operation from a previous installation attempt is still pending. A system reboot is required.

If this is a bit confusing because all you are thinking about an upgrade, which you never did, then please read this. It is possible that was only a feature update of Windows 10, and a reboot is still pending.

During the reboot, Windows get rid files that are no more needed to recover space.