“CompanionLink” can’t be opened because it is from an unidentified developer.
In OS X 10.8 Mountain Lion and OS X Lion 10.7.5, Gatekeeper, Apple's new malware app prevention feature, may disable CompanionLink from opening and you will receive the following message:
“CompanionLink” can’t be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the Mac App Store and identified developers.
To open CompanionLink, you will need to change your "Gatekeeper" settings.
- From the Apple menu select System Preferences > Security & Privacy
- Under the General tab under the header "Allow applications downloaded from:" select "Anywhere"
NOTE: You may need to select the Lock icon in the bottom right to allow changing this setting.
More info about "Mountain Lion: About Gatekeeper:" http://support.apple.com/kb/HT5290
Changing the setting to "Anywhere" will "Allow applications to run regardless of their source on the Internet; Gatekeeper is effectively turned off."
Using CompanionLink with Gatekeeper turned ON
In a future update CompanionLink will be available in the Mac App Store and will be signed with a Developer ID to support Gatekeeper. This will allow CompanionLink to open with Gatekeeper set to "Allow applications downloaded from: Mac App Store and identified developers".