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Some Mac users that have OS X Mountain Lion installed, have been experiencing issues where the error message "Sims3UIC is damaged and can't be opened. You should move it to the Trash." is shown. In Mountain Lion, Apple have implemented a new security feature called Gatekeeper. This is used mainly to prevent users running possibly malicious software, which hasn't been signed with an Apple Developer ID.
Normally this would result in an application like the UIC showing a message that it is unsigned, but due the way I have created the UIC app package, it thinks it has been altered/damaged. Until I release an updated version there is a way to get it working under Mountain Lion. The method to accomplish this, is to bypass Gatekeeper altogether. This can be done by following these steps:
1) Open System Preferences
2) Open Security & Privacy
3) Go to the General Tab
4) Change the "Allow applications downloaded from:" setting to "Anywhere"
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