I downloaded the 48 hours free versionTorchlight offered in gog.com. Copied it to Application/ folder and it failed to launch. Any advice would be great.

Thanks

on 10.8.3 too

same here!

www.gog.com/support/torchlight/ibread_first_mac_os_xb_faq_and_solutions_for_known_issuesi

Mac OS X versions unstable.
On forums i read that torchlight can run on BootCamp / Wine with windows version.

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.
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.

Same here.