Flash Player Upgrade/Downgrade
Couple of hours ago I was required to switch to a lower version of Flash Player 9. More specifically, I had to downgrade from 9,0,47,0 to 9,0,45,0 because r47 version crashed Firefox/Safari browsers when running a Flex app on Intel iMac. This actually wouldn't have happened if I upgraded OS X firmware on that machine, but the iMac had no permanent Internet connection and there's a reason for that.
I find this to be the best way to downgrade your FP:
1. Uninstall your Flash Player using Adobe Flash Player Uninstaller
2. Do a fresh install of FP version you require.
Here's the link where you can find archives of every release of FP:
Archived Flash players
This is certainly a nice reference to have in your bookmarks.