It sometimes becomes useful to keep old installers. As I wrote in our FAQ (https://www.emeditor.com/support/ – No. 6.), if the error message that says “The feature you are trying to use is on a network resource that is unavailable.” appears while trying to update or install EmEditor, first locate the installer of the previous version. The installer of the previous version can be found in one of the C:\ProgramData\Emurasoft\EmEditor\updates\update… folders.
However, if you are sure you don’t need old versions, you can safely remove those files. I could add an option to remove old versions of installers in future versions.