Then maybe, the issue is the browser.
Have you tried downloading using a different browser ? IE: Chrome, Firefox .....
Have you tried resetting Edge and then downloading anew ?
Start \ Settings \ Apps & Features \ Microsoft Edge \ Advanced options
Terminate
Repair
Try downloading again
And if the repair doesn't do the trick ....
Terminate followed by Reset
Try downloading again
Sometime these apps get hosed.
And Repair and\or Rest can do the trick.
Anyway, it's easy to do.