lightroom catalog upgrades
I have a question regarding lightroom classic upgrading catalogs after new releases. Because of different professional and personal situations, I need to have more than one lightroom catalog. I am used to lightroom needing to upgrade catalogs after a major release... What confuses me is: Using 14.2 I have opened and used all my catalogs. None of them ask me to upgrade catalog. However when looking unside each catalog folder on my drive, some catalog files are .lrcat and some are v13-4.lrcat... There seems to be no correlation between catalog age and the current naming convension. Why did lightroom upgrade some catalogs and not others? (or did it upgrade without changing file naming convension)? How come none of my lrcat files are 14...etc...?
