cevans, yes some have done that and been successful. In the past I've updated my Garmin via Active Captain app and I didn't save copies of the updates.
Garmin will not send you a previous update. Several people have made this update available through "dropbox" I'm just a little apprehensive getting the software through a 3rd party. It would probably be just fine but if I messed up something while doing the forced update then I got nothing.