This workaround allows you to access older GreenLight versions that use Flash content, after the abandonment general browser support for Flash in 2020.
- Download the FireFox Portable Version incl. Flash
- Extract the ZIP file to any location
- Run FirefoxPortable.exe and access your GreenLight applicance >> https://<gl appliance>/vimes/vimes.html
In rare cases it is required that you need to uninstall the Flash plugin completely before you can use the portable workaround. Microsoft offers dedicated windows updates for this.
https://www.catalog.update.microsoft.com/search.aspx?q=4577586
Additional Information:
Note:Above's workaround is just one option by using the Firefox portable browser. Other options exists which are mentioned on external sources
https://blogs.windows.com/msedgedev/2020/09/04/update-adobe-flash-end-support/
https://docs.microsoft.com/en-us/deployedge/edge-ie-mode