I upgraded today to version 9 and have no problems. Getting it authorized took a few times, One thing I did have to do is remove the 32 bit dll files from Jbridge. I was using Jbridge to run in 64 bit and the first time I opened Cubase I received an error. When V9 uninstalls V8 it only removes the dlls that were installed by the program. With Jbridge I had a separate folder that I kept those plugins in that I had Cubase reference.