Don’t EVER install Adobe Flash if a website prompts you to
From June 2020
If a website prompts you to install Adobe Flash, it is actually a trap to download malware. If you do want to install the latest version of Flash, only do so on the official Adobe website. However, even if you have Flash installed, it is best to not use it at all due to many security concerns with the plug-in that have been consistent for years.
We recommend not enabling Flash when enter a website even if prompted too because of security concerns. In fact, Flash would soon be removed completely from many search engines including Google Chrome and Firefox on December 31, 2020.