You must install the engine after reinstalling the operating system. Project files normally sit here:
But if you had a clean install of Windows, it probably wiped the partition. Also, please consider engine version newer than 4.6. Hope it’s a typo / translation errors and you meant 4.26.
Thank you for answering. The text below was created using Google Translate.
★Supplement★ The installed Unreal Editor (4.6 etc) and the created project were on different drives.
Example: :C=system drive.
:E= Editor and Project is there.
① Existing installed Unreal Editor. How to uninstall it. How do I uninstall it?
It doesn’t appear in the launcher, so I can’t uninstall it.
② Location of the project. Is there any problem if I don’t change it?