I did. Everything that other discussions suggest there. Acrobat remembers the last page but only for one-two days or for the last two-three pdfs!There are 1000 topics with the same problem that lasts for a decade and nothing changed. What's the problem? How is it possible?
It's not clear what you are asking. What is your problem in detail? I assume you have already turned on the option to remember the last page. (One thing you can't do: duplicate a file and have a separate position remembered for each duplicate!)
I'm sure you're right about there being many other posts, but I can't recall discussing this before. Can you share a few links to some of the 1000 topics about it, to save wasting your time by going over old ground...?