I've added in BGG1tool (1.18) the feature to download the game list from one family.
For example, if I want to see the games from the "Cthulhu Mythos" family, I write its ID (5141) in the box to the right of "Load family" button, and click on that button. When the left box is filled with the IDs, I click on "Load games" to download all the info for the games:
The direct link for the download is:
Games, software and BGG...
- [+] Dice rolls