In case you didn't install all your SDD Flows into C:\MentorGraphics, you can follow the procedure defined in How to switch between SDD Flow releases when they are installed to different target locations to switch between them.
New product releases based on Mentor Standard Licensing (MSL) v2012_1 are now shipping and support for some dongles has been discontinued. Please see the Hardware Key (Dongle) Discontinuations and Replacement FAQ to find out if your dongle is affected.
Learn some of the best practices and pitfalls to avoid that will help your installation of the PADS Flow go smoothly.
Best practices for a successful PADS Flow installation