Version 13.3 can be downloaded from http://www.goodsol.com/download.html
Version 13.3 adds 10 new games for a total of 790 games.
The new games are Aragonese Patience, Barney's Spider, Book Scorpion, Ceiling Fan, Eight by Five, Klondike Mini, Mount Logan, Open Peek Cell, Sticko, and Whistler.
Version 13.3 is a free upgrade for users who originally ordered version 12 or 13 (ordered since October 25, 2007) or have paid for an upgrade since that time. It is not a free upgrade for users who originally ordered version 11 or below. Users of older versions can upgrade for $11.95 athttp://www.goodsol.com/upgrade.html
The quick way to determine whether you need to upgrade to use version 13.3 is to look at your registration code. If your registration code starts with "27", "2r", "2p", or "2m", the upgrade is free and your registration code will work in version 13.3. Otherwise, you need to upgrade. If you registration code starts with "24", version 12 was a free upgrade but version 13.3 is not.
If your registration code worked in version 13.0, 13.1, or 13.2, it works in version 13.3.