After extracting this on my mac, it says it's damaged and needs to be moved to the trash.

Is there something wrong with the current Mac download/package, or do I just need to redownload?

READ FIRST (MAC OS X): Common troubleshooting steps

READ FIRST (MAC OS X): FAQ and solutions for known issue

I'm having the same issue. I've tried 3 times on two different networks. Same error every time. Any solutions? Looks like bad source files to me.

Did you read through the links in Post #2? Otherwise, you may want to contact support. GOG may need to poke their CDN servers.

This solution worked for me.

Game "is damaged and can't be opened. You should move it to the Trash."
a) Redownload the game using the newest version of the GOG Downloader:
https://secure.gog.com/downloader
To download, make sure the "GOG.com Downloader mode" is switched to ON before clicking the "Game installer" button. After the download is complete, reinstall the game.
b) Use this workaround if using the Download didn't help:
- Go to Applications -> Terminal
- Type in:
xattr -d com.apple.quarantine
but don't press Enter.
- Drag the application to the Terminal window, this should add the path.
- Press Enter.