hello and welcome!
i'm surprised you're having problems since the planner is very windows friendly. were you at all interested in a mac laptop...it has the option to boot up windows (bootcamp?)?
have you tried another browser? i use google chrome on a mac and it's like...heaven.
fwiw
...the file may not have been downloaded/installed to the correct folder. i only mention this because it happened often on a previous version (for mac) and i had to place it in both the main
library
and the user library.
good luck.