you do not need to buy it. from the Helpfile: Legal information and License. Program is PoseRay.exe and all accompanying files included in the packaged file PoseRayInstall.zip This program is distributed free of charge. You can use this program for any purpose you see fit as long as you give proper credit. You cannot directly or indirectly sell the program. I am not responsible for any direct or indirect damage that this program may create. Using the program implies that you agree to the above terms.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.