Guys there's this awesome program where you can make 3D digital scuptures

Its so cool. I tried it a couple of times. It was hard to work out mainly because unlike other digital art programs I'm used to there's no undo button. They should at that if they ever upgrade this program.
It doesn't work on Windows8 so I download it on my old laptop. I don't use the laptop since its sluggish compare to Windows 8.
I wanted to use it to make a 3D face models for my characters
I'll tried to upload a pic of the 3D model I'm working on Scuptris after I finished.
Here's a link to they're web site. The sculpting program is free LINK