Like 2 years before, all you need to do is:
- go to sites that have Flash and see if they still work and look like you expect
- test on any Flash applications you know and make sure they are the same as above
- install on a test target platform that you can install beta software on to ensure you have no installation issues
- test the new update mechanism
It comes with an uninstaller so you can easily uninstall when your done. The new update mechanism appears to be based off of the way Central installs products… sort of, so while it’s seamless and ubiqitous everywhere Flash Player 22.214.171.124 or above is installed, it’s a new way of doing things so it’s imperitive you test that, and give feedback and report bugs.