edge tends to change it from .litemod to .zip. Since Windows Explorer can open zip files almost like folders, perhaps there's some confusion there. Or maybe it is actually unzipping it for him too. Haven't seen that with Edge but it happens on Macs sometimes and is great fun.
Anyway, if someone is going to insist on using Edge to download, you'll get a .zip. Change it back to a .litemod file like so: http://quehow.com/how-to-change-a-file-extension-in-windows-10/4450.html Or use Firefox to download and don't worry about it