What happens if I delete old Windows updates?

Currently, you can uninstall an update, which basically means that Windows replaces the current updated files with the old ones from the previous version. If you remove those previous versions with a cleanup, then it just can’t put them back to perform the uninstall.

Should you delete old Windows updates?

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.