Where did you buy, and what are your computer details?
What computer operating system is your Premiere Elements 12 running on?
When you say rolling back, do you mean that the install is stopping with a "Shared Technologies" error? Or, are you
doing installs on top of installs in trying to resolve installation problems?
Please detail where your installation files are coming from and whether you are working with two
Are you doing the download and install with antivirus and firewall(s) disabled?
Once we know what you have done, then we can advise you accordingly.