they say that regardless of the fact that you downloaded a zip or executed a clone, you can install it. Unfortunately, there are nuances because when cloning, you must have authentication via GIT CLI and gh, which is not mentioned on the official epic page, which is very sad, because when downloading the ZIP format, you also need to download files for the engine from a web resource where you are not logged in, good luck.
I meant that at the moment only the GIT cloning method works. Because you need to authenticate through the installed gh during cloning, there is no other way.
To do this, you need to go through this guide carefully.