When using several techniques/languages/coding with the (open source) W3C-standards as guideline, Flash could be obsolete for many years already. If I'm correct this has been going on for about 10 years, especially after the discovery of many security-holes in the "software".
Good use of HTML, CSS , plus some jQuery/AJAX, and Flash is not needed. Ah, Flash is also proprietary. Less plugins make better webdesign. ;-)

100% agree with what the previous 2 commenters said. This is really an issue for website owners, it's 2020 and there is no reason to still be running flash. I'm actually surprised how many websites out there are apparently still running it!

Long overdue to be honest. Regroup and refresh your site now so there is no future impact if you are affected.