How to delete the previous version of Windows? After upgrading to Windows 10/11, your previous version of Windows will be automatically deleted from your PC. You can safely delete them yourself if you need to free up disk space and ‘re sure that your files and settings are where you want them to be on Windows 10/11.
Remove Windows.old folder, which contains files that give you the option to go back to your previous version of Windows. Deleting your previous version of Windows can’t be undone.