DOWNLOADING ADOBE DIGITAL EDITIONS 4.5

I use a Tablet that has Windows 10. Sadly, Adobe Digital Editions 4.5 does not have a Windows Store App so installation is pretty haphazard! When I downloaded Adobe Digital Editions 4.5 on my Tablet I was given a number of options on what to use (Microsoft Edge, Word, Notebook). I mistakenly used "Notebook". This means when I open a book on my Tablet it is unreadable. I have uninstalled Adobe, but when I re-install it the programme returns to the original installation and I am back to "Notebook".  How do I change "Notebook"  to "Microsoft Edge"? Ironically Adobe Digital Editions 4.5 works perfectly on my Windows 10 Computer. It is a pity Adobe does not support Windows 10 and Windows 10 Mobile.