"RuneRebels" is damaged and can't be opened.

[Alectrona]

I am on a Mac and RuneRebels has been loading fine until recently. I get the error "RuneRebels" is damaged and can't be opened. You should move it to the Trash.

[Elevate]

Delete the application and re-download it.

[Austin]

http://www.tech-recipes.com/rx/45404/mac-downloaded-app-is-damaged-and-cant-be-opened-error-solved/
This will help you out. Had the same problem on my moms mac. This fixed it for me :)

[Ry60003333]

Stupid Gatekeeper. I am trying to find a way to sign the client so it will open without changing settings...
but for now you have to open System Preferences, go to security, and change allow apps from to "anywhere".