Download the flash debug player from this location:https://www.adobe.com/support/flashplayer/downloads.html
Halfway down the page or so you will see the Flash Debugger players listed.
Download the appropriate debugger for your environment in this example we will use Firefox, so we will be downloading the one marked Firefox NPAPI from the above page.
Make sure all Firefox windows are closed, and then install the downloaded Flash debug player.
Next, open the "Run" box in Windows and type: %HOMEDRIVE%\%HOMEPATH%
and hit Enter, which should open your home directory (e.g. C:\Users\Administrator).
In this location, create a new text file called "mm.cfg" and put the following two lines in it:
ErrorReportingEnable = 1
TraceOutputFileEnable = 1
(For more information on these properties, visit https://helpx.adobe.com/flash-player/kb/configure-debugger-version-flash-player.html
Save this file and then launch Firefox.
Navigate to https://helpx.adobe.com/flash-player.html
and click the "Check Now" button and verify that the debug version is installed:
<Please see attached file for image>
After you have verified this, you should reproduce whatever issue you are having with Flash using the same browser.
Once you've reproduced the issue, open the "Run" box in Windows again and type: %APPDATA% and press Enter.
This will take you to your AppData folder. From here, navigate down the following path:
You will find a flashlog.txt in this location which you should return to us for analysis.