Adobe is stopping support for Flash, not Air. The old chat version was Flash based, hence the move to Air.well. When I go to sign in it crashes.
Also there was a trick where you roll your clock back to november 24, 2019, then you can install adobe air. then you change the time back, and then the installer works fine.
Considering Adobe is cutting support for this app, it seems that it might be a good idea to stop using Air to run it.