[Sylver]

Hi, forgive me if someone has asked this before. I have upgraded a dozen versions now without any noticeable issue, each time a new version is installed on top of the old, I don't have to uninstall the old one and my library is kept intact and everything seems to be working fine. I was wondering can I do the other way round if I have to go back to older versions, that is, directly install an old version on top of the new version and still have all my books in good shape in the library? or do I have to uninstall the new version first if I need to go the other way round? Just curious.