Activating Renderin

I have downloaded the trial version of Renderin and still have about 27 days left. I have already decided to purchase the program but cannot figure out how to do it. I have Uninstalled the software once in an effort to get this done. I have clicked on the Buy tab and I only get a blank page. Any suggestions to get this to work?

Hello, i downloaded this software for trial but in sketchup it pop up a box asking license key? is it free to try ?