A few days ago I downloaded the MAC version from GOG to my MacBook. It worked just fine.
Yesterday I downloaded it to my iMac but this one says "Total Annihilation Commander Pack is damaged and can't be opened. You will need to delete the disc"

I tried restarting the Mac and even re-downlaoded the file but nothing fixed the problem.

Can anyone help, please?

Problem is fixed

Same problem appears

The problem is still there. Gatekeeper says that the application is damaged and should be trashed.
Tried to start it from the Applications folder and from the DMG. In both cases, I got the message that I should trash the application. Looks like the signature is not correct.

Same issue here, using OS X Mountain Lion

same here: damaged and can't be opened
10.8.4 Retina

Same here, this is my first gog purchase - bit disappointing.
OSX 10.8.4

Same here. Was this somehow resolved?

Same here

As long as none of you contacted Support and let them know.

Did any of you bother to read this?