Yes. The packages that you need will be on the disk. You will need to add
the disk to your package manager sources and then it should look for them
there. Or you can browse for them with the file manager and once you locate
the debs install them.
It is more straight forward to use a connection because you will get the
latest releases.

I've tried doing what you suggest, and the system refuses to add the disc to the
list of sources. Can you give me a step-by-step walk-through, so to speak? In
the meantime, I'll try browsing the disk with the file manager as you also
suggested.