Set it once, and you never have to worry about cleaning up disk space manually again.
The downside is that the previous installation files are deleted after exactly ten days.
That kind of overhaul typically runs 0 to 0 per window, and by the time you’re finished, the old windows may wind up nearly as efficient as brand new ones.
Besides, some old houses have beautiful windows that are well worth keeping.
Windows 10 will delete previous versions of Windows 10 ten days after installation of the update.
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Word of advise: It is recommended to remove the old installation files only if you are confident that you don't need to roll back to the previous version.
If you are in doubt, create a backup of the main Windows partition so that you may restore it should the need arise to roll back the Windows version.