My internet connection is very slow, and I need to update my OS to 10.7.3. Can someone give me step-by-step instructions as in how to download from another computer and install it on my MacBook?
Download the 10.7.3 combo update from here:
Burn it to DVD (or split it and burn to 3 CDs).
Run it on the target machine. It must already be running 10.7.0 or later for this update to install.
If you want to update other Apple software offline, this page has links to many of the common Apple updates: