You are a Mac User and have problems to unzip something?
Please follow the following instructions and all should work for you :)
Mac - User Information
If the default Mac decompression utility ('BOMArchiveHandler') says that it can't decompress the
downloaded ZIP file, there are two things to do.
1. Use a different decompression utility. Either Stuffit Expander or any of several free- and shareware utilities
which can expand ZIP files, should be able to correctly extract the contents of the ZIP.
2. In the Finder, select the ZIP archive and choose 'Get Info' from the File menu.
In the 'Ownership and Permissions' section of the Info window, click the 'Show Details' disclosure triangle;
set your current user account and the current group to have 'Read and Write' permissions.
You may need to enter an admin password in order to authorize this,
but you should then be able to properly extract all the files from the ZIP.