Download the offline installer here: http://fpdownload.macromedia.com/get/flashplayer/current/licensing/mac /install_flash_player_11_osx.dmg
Mount the DMG and run the installer
If it won't run, go to: Mac HD/Library/Internet Plugins
Trash the Flash Player.plugin file from there
Go to: Mac HD/Library/Application Support/Adobe
Trash the Flash Player folder (the whole folder)
Empty the trash
Mount the DMG and run the installer again.
When I try the offline installer link I get this error:
The requested URL /get/flashplayer/current/licensing/mac /install_flash_player_11_osx.dmg was not found on this server.
Can you right click and "Save as"? It's a good link... I just tested it.
I had the same problem and it looks like Safari was my problem. Firefox works without any further Flash installation. This has been reported as a bug to Adobe.