This is a side by side installation with v10 and I've tried both upgrading and uninstalling and reinstalling. Curiously, if I try to go back to v11.0.0.142 it now also gives me a trial expired error.
We've now released v11.0.0.198. Please could you try installing the new beta version and see if it fixes your issue? I'd like to point out that this version is timebombed to expire on 30 September 2014 and you'd see trial expired issue if your system date had been interfered after installation.
I received a popup window when executing at the command line using the new beta stating that my trial period has expired although the console window message stated that the trial was valid until Sept. 1. The window said to press the skip button to continue the trial however skip button was grayed out. I ended up trying my current Toolbelt license and that made it go away. I'm not sure why that worked but it did, hopefully I didn't just waste an activation.
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This is a side by side installation with v10 and I've tried both upgrading and uninstalling and reinstalling. Curiously, if I try to go back to v11.0.0.142 it now also gives me a trial expired error.