Clearing up old Windows versions

If your space is getting less and less there are many ways to clear up some free disk space...

On way is definitely clearing up temporary browser data or the Windows-TEMP folder (C:\Windows\Temp).

Another way is using a tool like TreeSizeFree to narrow down the areas where some big files are hidden. Sometimes there are big video files or downloads you are not aware of anymore.

But, also important is checking if your computer was reinstalled in a way to keep the old version active. You see that, by checking the C drive, if there's a Windows.old folder. If so, you can proceed as it follows:

For Windows 10, go to Settings/Storage and check for Change how we free up space automatically. Scroll down and you can check for cleaning up old Windows versions. It takes a while, but once that's done you can make up a lot of space. In my case more than 30 GB.