I use a macbook pro with fusion for windows programs. Have been trialling sketch up 2014 windows and mac versions.
I discovered your site while querying BIM with sketch up. Downloaded the trial and loaded it to the mac version of sketch up. Began tutorials and had trouble with the wall creation tool. Attempted to load plus spec into the windows version and received message that license usage is exceeded. I have now deleted the mac version of sketch up and would like to continue the trial of plus spec on the windows version. Any assistance would be appreciated .
Hi twm,
Which email address did you register the Trial with?
There is one Activation code for each Trial - I can reset this so you can install it on your windows machine.
Thanks,
Dan
Trial has been reset ! 
Thanks,
Dan