I'm facing also an issue when I installed the package 11.1.353_EN on my laptop running Windows 8 Pro 64 bits. At the very end of the installation the process was stuck and nothing to do. I tried to uninstall the package in using Windows uninstall tool and it crash as a dll wasn't able to be unregistered.
With the previous version 11.02.276_EN it was ok even if I'm some doubt as after installing the software I faced issues to install some Windows update related to the .net Framework.
For the time being I will wait until Mindjet release an improved version.