I'm seeing a lot of needlessly complicated procedures being recommended online, including third party software, installing older versions of flash etc. All of those are unsafe and unnecessary.
You can download a simple program from the official Adobe site here: https://www.adobe.com/support/flashplayer/debug_downloads.html. Both the debugger and projector work fine for me. From the main page, download CoC (right-click and "save as"). Then start up the debugger (or projector), load the CoC file and Bob's your uncle. I haven't encountered any issues so far, saving and loading also works fine.
You can download a simple program from the official Adobe site here: https://www.adobe.com/support/flashplayer/debug_downloads.html. Both the debugger and projector work fine for me. From the main page, download CoC (right-click and "save as"). Then start up the debugger (or projector), load the CoC file and Bob's your uncle. I haven't encountered any issues so far, saving and loading also works fine.