Switching from CS4 & LR5 on Windowns desktops to CS+LR monthly subcription for Mac: be aware of, or beware of, before/during?

Just switching from CS4 & LR5 on Windowns desktops to CS+LR monthly subcription for Mac, with catalogues, files etc residing on external HDD (multi-location living; lots of travel). Anything I need to be particularly aware of, or beware of, before/during? Thanks a lot for suggestions, recommendations, tips, experiences. Best, Joachim