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Re-downloaded several times. The dmg mounts, and I copy the .app to Applications, then upon launching from there, I get the dialog in the attached screenshot (text in subject above). OS version is 10.11.3 (El Capitan) on 17" MBP. Any advice appreciated.
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nharkins: Any advice appreciated.
Despite the message try this:
<span class="bold">Game "can't be opened because it was not downloaded from the Mac App Store" error message</span>
a) System Preferences -> Security & Privacy -> unlock to make changes -> select Mac App Store and identified developers.
or
b) Right-click (or cmd-click) the game -> Open -> confirm Open.