How can I install 9.0 simultaneously on the same server with my existing 8.5 installation?
No. The installer will always upgrade the 8.5 installation. Even if you did manage to get two installs on the same box, only one will run at a time. If you're looking to test v9 and still run your production v8.5 installation, I recommend running v9 on a separate box and use the "backup now feature" and "v9 restore utility" when you're ready to go live.
Ok, thanks. What I am interested in doing is using this upgrade as a time to completely start from scratch with version 9 and create new monitors, and do cleanup while reviewing and copying my monitor points from 8.5.....side by side...when one is up in 9, remove from 8.5.
Can I license both at tht same time?
If you run out of time, the support staff can assist you with elongating your emergency license.