Does anyone know?

Should Flash Player 8 be uninstalled (with its own uninstaller) before
updating to version 9?

Based on past experience, it is my recollection that updating to newer
versions did not automatically clear out older versions, which meant that there
were still potential security issues that had not been completely resolved by
updating to newer versions. So, does the older version need to be uninstalled?

Also, does the newer version still have the same problem with limited user
accounts as its predecessor?