Can't upgrade Windows 10 with low capacity on the C drive?

If you upgrade to the updated Windows 10 version through Windows Update in recent weeks, you may be very happy to see the excellent new features that Microsoft offers - when the hard drive is in a low capacity state, it can't meet the upgrade requirements, except through the disk cleanup tool. Free up space and choose other disks or connect to removable storage devices. This means that users do not need to clean up a large amount of storage space to upgrade to a new version.

So in comparison to the user in the folder hidden under the C:WindowsSystem32SystemStuffuntitled folderuntitled folder 2, the user only needs to simply insert a 16GB USB flash drive and Windows has enough external space to upgrade. In the process of downloading/installing a new version, there will be such a window popping up, so it is best not to stop the external storage device from working.