Download the trial version from http://www.goodsol.com/mac/download.html
Pretty Good Solitaire Mac Edition includes 375 games - see http://www.goodsol.com/mac for full details.
This update includes adds 25 new games, bringing the total to 375. The new games are Brigade, British Constitution, Cast Out Nines, Deuces and Queens, Dial, Diavolo, Easy Diavolo, Emperor Penguin, Fifteens, Forty-Nine, Four Leaf Clovers, Free Fan Hard, Hidden Treasures, Letter H, Milligan Harp, Octave, Pharaohs, Puss in the Corner, Reserved Pyramid, Rueil, Scorpion Head, Shady Lanes, Shifting, Tens Out, and Undercover Aces.
This is a free update for all registered users - if you have the full version installed, just start the game, go to the Internet menu, select "Download Latest Version". You will then be able to download the full version.