I'm pretty sure you can, but search up "can Overwatch be played on a mac" just in case 
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Terraria Community Forums
Gearzoid II
FlyKip
i did. Over and over (watch)
Gearzoid II
Looks like it can be played on a mac, but do you know the download instructions? If not I'll give you the link to the instructions from OWs Twitter.
FlyKip
Why? Is it different from "Click download?"
FlyKip
Where is the link?
Gearzoid II
Just read some more, and it looks like free weekend isn't for mac users :/.
FlyKip
da 
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FlyKip
WHY BLIZZARD!
Gearzoid II
It only showed installation instructions for Windows, PS4 and Xone users, not Mac.
FlyKip
Huh. Well, it has been downloading for awile, so its almost done.
Gearzoid II
Hmm, ok. Let's wait and see if it launches the game.
FlyKip
Its giving me an error.
Gearzoid II
I can't troubleshoot from my phone, but when I get home I could see what can be done. Maybe your mac doesn't meet the required system specs?
FlyKip
It says overwatch cannot be played on a mac. Why didn't it tell me that when i went to install it?!?!?!!