My pack will not download and game will not open on the new MAC EA app

Hey, so the problem is not on my MacBook Air. On my computer MacBook Air, the expansion pack is downloaded, but on my Mac mini it just says the same as yesterday. it just says preparing, and I have tried to delete it and then install it again, but it dosen´t work. I don't understand? Why is it downloaded on my MacBook Air, but not on my Mac mini? 

Please help??? 

I want to play with my new expansion pack, but I can't until it's fixed and it is done downloading. 

Help ?????