3d max on macbook

i have macbook it have mac system and windows XP i download 3d max on the windows but i dont know why it just work for 6 month then it closed then i download the 3d max again but it just works 2 month and close and now when i download it it just work for some month and close without any resin?
so i keep formating the laptop 2 download it again?
the 3d max just keep stop working on my mac?
 
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