No Live Preview for selected device

I have a Canon SLR Eos Rebel XS and using snow leopard 10.5.6 on Istopmotion version 2.8.4 or lower. I can not figure out a single thing to work on the software with my macbook pro. MY firmware for my camera is 1.0.7. it have 8 gb free space. i am connect with the pin plug in the usb with it. Can anyone help me how to fix it. THank you.

I am very sorry for that! Unfortunately most Canon DSLR cameras are no working on Mac OS X Snow Leopard prior to v 10.6.8. Apple had a bug in its image capture framework that we are using, that broke the support for Canon cameras in those releases.