As of R2010b, MATLAB is only available in 64-bit version for the Mac platform. For releases 2008a and earlier, it is necessary to to use the "-maci" flag in order to install 32-bit MATLAB on your 64-bit Mac:
In order to complete the activation process it may be necessary to temporarily change the Java used by the OS, otherwise an 'unexpected exception' error will occur. For more information, see the related solution 1-8GS5S1: "Why do I get an unexpected exception when activating MATLAB 7.8 (R2009a) or earlier on a Mac OS X machine?"
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