SUCCESS! After several hours of downloading, unarchiving and transferring some files on my old Windows XP based desktop PC, I had what looked like some WHDload installation files for several games, but not the games themselves, apart from a couple of exceptions. None of them have the extensions ADF or DMS, though. I didn't put them in directories such as A, B, C, etc.
After all of this I tried clicking on all of the very small game icons, which seemed to be designed especially for WHDload and I was surprised to see them get as far as the WHDload registration nag screen. After that, I got error messages, which were usually that it couldn't find a Kickstart 1.3 ROM image. I think some of these games are capable of running from floppy disk without a 1.3 ROM though.
I didn't always try the games in alphabetical order, then was pleasantly surprised to find that Eye of Horus, Bloodwych, and Advanced Ski Simulator all ran! Eye of Horus had been cracked so the player didn't have to input anything from the manual, though.
Now I'm totally exhausted and looking forward to a good night's sleep! Later today I plan to install the Kickstart 1.3 ROM image which I think is on my Amiga Forever DVD and an accompanying file which is either on a WHDload site, and/or on Aminet.