Maintainer of the project here. Let me see if I can help you get it running.
> Download > We don't have downloads, but here's a download link > Archive search link, not direct link > eventually find big file > download…
We do not distribute the files because old games are still under copyright, so we can only link you to a search for builds other people may have done. I’m sure you saw the message about that when clicking the link :)
> Search which emulator is the best > WinUAE/FS-UAE > Pick FS-UAE > No installer > Download 4 rando zips > two need to be extracted in a nested location that doesn't exist until you run FS-UAE-Launcher.exe first
Yes, Amiga emulators are legendarily unusable and hard to work with, unfortunately. FS-UAE is your best option unless you are willing to learn how WinUAE works. I plan to create a WinUAE setup to include in AmigaVision, so I bought my first Windows computer in 20+ years because I care about things being as easy as possible — although I can’t fix the emulator user experience more than to try to give you a default setup that just works.
> Extract Amiga.vision > readme says "Double-click the `AmigaVision.fs-uae`” > Filetype not associated > open with FS-UAE-Launcher.exe
The launcher is not necessary. You should open that file with the main FS-UAE app. This is probably why the rest of the steps did not work. Could you try that?
> Search FS-UAE/WinUAE AmigaVision > videos > none
There are plenty of videos on AmigaVision, but since the project originally was built and optimized for the MiSTer FPGA project, most of the videos cover that instead. There are a few videos in German/Portuguese/French if I remember correctly that use emulators.
As mentioned, emulator support is still newer, and since I just got my Windows computer, it has only been tested properly on Mac until now. So either you found a bug I am not aware of, or it’s just a matter of opening up the file with FS-UAE using the right click menu in Windows.
Let me know how it goes, and happy to help you get it running — I want to know if there are bugs too, of course! :)