as a side note, if you sign up for Epocrates Pro for a year, then decline to renew your Pro subscription, the program will revert to regular old Epocrates. However, it will sync and update normally on your mac. Seems to me that Epocrates was just lazy and didnt want to code an install in OSX for the free version of Epocrates, as I've continued using Epocrates without a hitch for the last year since my Pro version expired.