|The end of Flash - browser support to end in 2020|
Standalone still works on mine.
It's only for Windows btw. And maybe your version of Windows is blocking all Flash/Adobe AIR apps? I dunno.
Anyways they should change the Adobe AIR link to this new one.
in this ol' Standalone thread >>> https://atelier801.com/topic?f=5&t=164808
Adobe themselves sold off AIR to Harman... the people more well-known for audio speakers.
You can also find AIR installations on Archive dot com and probably some other archives that kept old Adobe stuff.