I am trying to install epic games launcher without success

Hello all, I am attempting to install the epic games launcher(on a fully compatible PC) in order to allow my grandson to play FortNite on PC.

I am prompted to download file “EpicInstaller-7.16.0.msi”, which default-downloads to D:\users\owner\downloads. When I ‘double-click’ on that file, I get a message stating

“Windows cannot access the specified path, device, or file. You may not have the appropriate permissions to access the item.”

I am able to ‘extract’ the files, which gives me a folder with 3201(76Mb) files including ONE executable, “DXSetUp”. There are no other executable files. Can someone explain why the “Epic Games Launcher” is only a setup for DX?