Most likely the distributor of the font bundle included corrupted fonts or the OSX versions of the font.
Try the following:
1. Generate MD5 checksum of the font(s) and ask the font designer and the font reseller to send you the checksums for the font files. Also ask the font designer whether he released separate OSX and Windows versions of the font.
(If you don't have an MD5 GUI tool try
MD5-Checksum.)
2. Try to convert the fonts with the free 15-day trial version of
CrossFont. If that generates useful fonts, the font bundle definitely included the OSX fonts.
(If CrossFont doesn't like the input files they're most likely corrupted.)
3. Open the font files with FontForge and resave them. (If FontForge can't open the fonts they're definitely corrupted.)