The trial version can be downloaded from http://www.goodsol.com/mac/download.html
Pretty Good Solitaire Mac Edition includes 420 games - see http://www.goodsol.com/mac for full details.
This update includes adds 20 new games, bringing the total to 420. The new games are Acme, Block Ten, Cadran, Capricieuse, Demon, Double Easthaven, Double Golf, Double Trigon, Harp Rush, Huge Spider, Kingdom, Nine by Five, Open Doublets, Opus, Quadruple Trigon, Richard's Patience, Right and Left, Seven by Four, Six by Four, and Trigon Left.
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.