I have a FreeBSD installation that had an upgrade failure between 8.? and 9.4 (IIRC). In the interest of getting 10.2 working properly on the machine, I downloaded the DVD image and burned a disc. Now I'm trying to figure out how to do the upgrade, and all I can find are instructions pointing to freebsd-update() which appears to only do an over-the-air upgrade, which would involve downloading FreeBSD again from the server. That's neither a reasonable use of my bandwidth nor the server's resources.
I booted onto the live CD, mounted the existing /usr partition, and copied the contents of the /usr/freebsd-dist to the hard disk so I'd have ready access to the source tree: I'm guessing I'm going to have to build the new installation from source.
Am I going down the right path? Is there an easier way to do this? Can I tell freebsd-update() to use the DVD instead of a remote server as the upgrade source? How would I do that?