If you have rules questions about your CATAN games, you can find all of the latest rules PDFs as downloads on CATAN.com.
You can click over to the listing of all the CATAN games: https://www.catan.com/game/catan
Click on the game you have questions about, and you'll see tabs over to the right of the page. You will see Downloads and FAQs. Click Downloads for the updated rule books and Almanacs, if appropriate. You should also see a tab for FAQs.
If you are new to CATAN and you want some assistance getting started, here are some valuable resources:
- Catan Assistant app for iOs and Android - https://www.catan.com/service/how-learn-catan/catan-assistant
- Watch this video on How to Play Catan: https://youtu.be/oiQ6SgBzfqY
- Play Catan Universe (Steam, iOs, Android, Browser). You can play the single player tutorial for free: http://www.catanuniverse.com
There are also a lot of answers to FAQs here: https://www.catan.com/faq-page/93