I've tried deleting the current updated version and then installing the older version, but a message window comes up (one from Adobe) telling me a newer version is available. It won't let me install the older version. How can I get around this and install the older version? Thanks.
You have to uninstall (not delete) the current version first; perhaps try using the uninstaller from http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html
Download the old installer from http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html
You may need to disconnect from the Internet to prevent the installer from checking for new versions.