I have installed thea render v1.5 successfully,
but i couldn’t get the thea render plugin from "plugin tools "
im new in sketch up. wish to get it fixed.
Thank you. 
Try to download this and install
http://www.thearender.com/plugins/sketchup/v1.5/TheaForSketchUp_v1.5.02.310.1371/TheaForSketchUpBundle_v1.5.02.310.1371.exe
I think you have just installed Thea Studio !
Is there a mac version? I’m having the same issue.