Can I update without internet connection?

Hello all,

I'm assuming the answer to my question is no, which leads me to another question: Is there anyway to undo an update?

My problem was posted a bit ago over here but sadly it hasn't gotten solved and I'm at a total loss as to what to do. I'm trying to avoid wiping my system at all costs.

Since my problem began after an upgrade, I want to figure out if that is the cause. So can I undo the upgrade? or see if another upgrade is available? (it won't let me because I have no network connection, wired or wireless).

Thanks.