I know you're talking about Mac OS, we'll look in the issue ASAP and fixed the warning (it shouldn't be there of cause). About archives: what is the format of those archives? There could be many reasons for incomplete decompression.
Update: 2.9.6 Build 5105 - fixed issue with software piracy; Using illegal serials can cause Uninstall Tool to work incorrectly! Please beware of them, the only way to get a good, reliable Uninstall Tool is to purchase it to get free updates and life-time support.
Update: 2.9.6 Build 5102 - fixed removing of Control Panel Icon in 64-bit version of Windows; removed setup option of creating a Quick Launch icon (in Windows 7 only - there's no quick launch in this OS)