Are you up-to-date? Registered users can take advantage of our free incremental program updates: these are far more than just "bug fixes", and frequently include major new features that extend the program's functionality.

Mac OS X 10.4-10.7 ("Tiger", "Leopard", "Snow Leopard", "Lion")
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Windows XP, Vista, Windows 7 (including 64-bit)
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Free CrystalMaker Demo. If you are not a licensed CrystalMaker user, you are welcome to download a free demonstration version of CrystalMaker, which includes crystal and molecule example files, and can also be used as a free viewer for CIF, PDB, ICSD and many other file formats.