Attempting to run the previous version at the same time would have no effect, and as you noted, wouldn't be allowed. This is because you can run only one instance of the program at the same time, and the two versions have no idea they are necessarily different.
This is very unfortunate, though, because there is no way at present for me to reset the trial period for you. I may need to build in a way to do this in the future, but for now, I'm very sorry to say, you're out of luck. If you have access to another computer, you could install and evaluate it there.