Buy the Windows Version
If you buy the Windows version (which has been used by thousands of players for years) you’ll also get the new version for free when it’s released.
(Heck, if you want you can email me and I’ll let you help beta test the new version giving you access to it now. It’s available only to owners of the program.)
Which version did you want?
Chess Openings Wizard Express ($67)
Chess Openings Wizard Professional ($197)