It can remove temporary files, old Windows files, Thumbnails, Delivery optimization files, Windows upgrade logs, and so on. … When purging the files, the process could be slow and take forever to complete.

How long does it take to purge Windows Update Cleanup?

Unreferenced components are removed immediately, and the task will run to completion, even if it takes more than an hour. (I don’t know if the one hour timeout is actually meaningful in practice.

Is it OK to clean windows update cleanup?

Windows Update Cleanup: When you install updates from Windows Update, Windows keeps older versions of the system files around. This allows you to uninstall the updates later. … This is safe to delete as long as your computer is working properly and you don’t plan on uninstalling any updates.