We didn’t need online access back then, we had LAN parties.
Most of the time you didn’t need updates, because back then they were much more diligent about making sure a game released without bugs. Yes a few existed, but much less than what you see in today’s games. A showstopper bug was death for sales, since it couldn’t be fixed inexpensively.
And those instruction books, especially if you are into the artistry that they put into them, is sorely missed, truly.