Pretty Good Solitaire for Windows has recently updated to version 16.2 with 920 games. This new version also includes many improvements for running on Windows 10. If you haven't yet downloaded this new version, you can download it at http://www.goodsol.com/download.html . In addition to Windows 10, the game works in older versions of Windows back to Windows XP.
Pretty Good Solitaire for Mac has also recently updated to version 3.30 with 700 games. The trial version can be downloaded from http://www.goodsol.com/mac/download.html . If you have purchased, you can download the new version by going into your current version, go to the Internet menu, select "Download Latest Version". Note that this works only if you purchased the game from us, the Mac App Store version has not yet updated. The Mac version works in current versions of OS X and back to Snow Leopard.