At present, I run 12.2. Would like to go to 13.1. I believe I cannot do that as an upgrade. But can I:
Install 13.1 in ADDITION to 12.2? I go lots of space, 12.2 lives on the 1TB external hard drive, W7 on the internal drive. Of course, I would
remove 12.2 later, after 13.1 is fully set up..
Run 13.1 from the DVD first, to try it out first? I looked once already, but all it says is INSTALL.
Like Carlos says. I mostly have two partitions fit for use as root partition. Install the newer version on the usused one. Then you still have the old one as a fall-back. And you can of course mount the old one (read-only) somewhere when needed and then check the old configurations in e.g. the old /etc. E.g. when you mount the old 12.1:
mount -r /dev/sdnx /mnt/os12.2