Uninstall Adobe Flash CS3

As you can probably imagine, we don't have a test team dedicated to managing super old product versions on modern operating systems.  A lot of the work we do on a daily basis is the maintenance involved in keeping our products aligned with the latest operating system changes (particularly on MacOS, where they're pretty aggressive with continual breaking changes). 

I don't like to give advice that I (or my team) haven't tested first, so I'll leave that decision to you.  If you don't need the disk space, simply having files on the disk is low risk.  If you do choose to start deleting stuff, make a backup first, and make sure you can revert should the changes prove damaging.

In terms of Flash Player, the big attack surface is around the browser plug-in, which is primarily tasked with running untrusted content from the open web (e.g. banner ads, etc).  In the lead-up to Flash EOL, we (in tandem with our browser partners) have already taken a lot of action to minimize that attack surface (making Flash disabled by default, click-to-play, etc.).  In a few days, any existing copies of Flash on your system (assuming they're reasonably current), will themselves also stop loading content from the open web.

Flash Authoring / Animate CC presents far less risk, as you'd need to actually open, compile and debug/run malicious content on your local machine for any malicious SWF to execute.  (Installing Flash Authoring / Animate CC may install a debugger variant of Flash Player, which our uninstaller will remove).  

You can remove the Flash Player plug-in on MacOS by running our uninstaller

https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html

Thanks for the advice. I tried the Creative Cloud Cleaner tool but it doesn't seem to have helped. I'm not sure if it did anything but all the Adobe folders still appear to be there. It doesn't look as though anything was deleted.