If you folks have found a solution that works then great. If not, the following works fine this end:
I have a shortcut on my desktop that, once clicked, opens wgt on the game client.
I use an ancient stand alone version of flash player with the up to date pep version contained within chrome disabled.
To stop the 'Your flash player is out of date' pop up appearing and to allow the old flash to run fine I added a 'flag' to the target box of the aforementioned chrome shortcut.
To clarify:
Chrome Address before:
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"
After adding 'flag':
"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --allow-outdated-plugins
Works fine for me even if Chrome itself updates.
I can, but prefer not to, manually edit the register whenever poss.
*if trying the above ensure you type a blank space directly after the original Chrome address.