I tried the professional trial but now wish to go back to the free version. No matter what I do it continues to tell me that the pro trial period has expired (I know that!), which is becoming very annoying. I've tried uninstalling & reinstalling. I've tried upgrading. I can't get it to offer to return to the free version without the pop-up.. I'm currently using the 2015 SP3 32 bit windows version which asked which license I wanted during the install; I selected free to no effect.