Flash won't work on United Airlines - Need to downgrade to ver. 29

I just spent an hour trying to get a browser to revert back to ver. 29. The only one I was able to succeed with was firefox, but my firefox version is also 'to new', currently version 72. For the record, here is the link to united's supported devices chart (down at the bottom in a drop down menu) http://unitedprivatescreening.com/personaldevices. Firefox is clearly limited to version 51 and in the footnotes it specifies flash player prior to version 30. I am flying united tomorrow and will be happy to screenshot any issues I have, as I plan to try Chrome and Internet Explorer as well, but as these users have mentioned I too have experienced these issues before (last year and earlier). 

I have had the same problem for years and I think it has to be a Flash issue. If you pull up their in flight URL the add for their Visa card plays all the time with sound and such. You can page through all the movies but the screen "greys out" when you try to play the movie. It is the only reason I take my Android tablet on the plane that I'd like to leave home because it plays all the time on it. If you send an email to United support you will get a cut and paste of the same message they've sent thousands of times. It is so frustrating because it may work for a few weeks--something gets updated, and it goes to the grey screen. I've not seen one consistent fix. I have tried Chrome, Edge, Explorer, etc. I may nee to try Firefox on my next flight. 

What's far, far more likely, is that you need to just active Flash Player in your browser.

Flash Player Help

I am unable to use the United Airlines entertainment platform on my Microsoft Surface because United does not support devices that have Flash higher than ver. 29, as well as some other parameters.

It seems rather odd that there would be an upper limit on the version of Flash.  Usually it's the other way around.  I've never seen a situation where a content creator enacts an upper limit on the version of Flash that is supported.

What is the exact link to the content you are attempting to view?

I tried to uninstall the current Flash (which is ver. 32) but I think it is integrated into Internet Explorer 11 and cannot be undone.

As of Windows 8, Microsoft embeds Flash Player in IE (and Edge on Windows 10) and the embedded version cannot be uninstalled

I tried to uninstall the current Flash (which is ver. 32) but I think it is integrated into Internet Explorer 11 and cannot be undone.

Google also embeds Flash in Chrome and only loads the most recent version of Flash.  If you install a previous version of Flash Player PPAPI for chromium-based browsers, Chrome will not load it.

Another option is to use Firefox for Opera and install the previous version of the NPAPI plugin (Firefox) or PPAPI (Opera), however, using out-dated versions of Flash is not recommended (especially on an internet-connected machine) due to security vulnerabilities that have been fixed in subsequent versions of Flash.