Have Norton Vs 16.1.0.33, How can I get the version 8?

I downloaded the newest version, I think version 9. Since I got it, my computer freezes. I don't see the BSOD but everything stops working, and the only solution is to TURN OFF the computer.

 

How can I revert back to version 8? I think the version 8 is more stable than version 9.

 

Can someone help me? I don't want to use version 9 anymore until all it's problems are fixed.