The Fake Flash Player Update PopUp is a web browser advertisement shown by scammers that are trying to trick you into downloading adware installers. They do this by showing an alert that states that ...

If you see pages offering Adobe Flash Player updates and the site is not adobe.com, just close the page. If you continuously see these alerts, though, it could be adware displaying these scam sites ...

Since Adobe itself has discontinued this product, there are no official fixes to the issue. However, there are some solutions you can implement to unblock Flash Player on Chrome, Edge, Firefox, Opera, ...