The good thing about the prior software was that you could set it to show 75 posts per page. Making it much easier to print long threads. The current software only allows for 25 posts per page with no way to change it. Perhaps that is why you are thinking the prior software allowed for this. I don't recall any way in the prior version of vBulletin that allowed you to easily print multi page threads other than to print each page separately.
Chrome does allow you to save to PDF, but you would still have the issue with multi page threads. If there was some ability to increase the number of posts per page, I sure would like that even though I never print anything.