This is what i did in a virtual enviroment. But do you now the upgradepath for existing 9.0- installations? New install or up2date or upgrade by image?
The up2date package is available through the up2date server, so you will be able to perform this via your webadmin.
Please also check this link regarding the download information:
Maybe my english is too bad. I know the beta downloads. I performed them. But if 9.1 will be final, how can my 9.05.15 then be upgraded to 9.1? New install, download and update? How has that been done in the past?
When the final version is released (General Availability), you can either update via the Up2Date mechanism or install from scratch using the ISO and a configuration backup.
During the beta phase, the U2D package from stable is only available internally for QA. I, for myself, never understood that policy, though.