While at this point there is no proof they've changed anything on their cd-rom library we cannot assume they will change things on their online library either. It doesn't mean they won't "update" their publications as has been done with Revelation book and few others which does amount to changing the original thought but these changes weren't covert. They did however change few instances in their bound volumes from original watchtower study articles in the past when dealing with end dates occurring prior to year 2000 which on the other hand haven't been announced to general r&f.
One doesn't need to save hard copies of their crap as it would take up too much shelf space, but simply dl their pdfs and compare anything down the road if you need to.