1. Download the root certificate (bundle) here.
2. Download the intermediate certificate for YOUR instance’s region here.

Open both files in a text editor. Copy the contents of the intermediate certificate to the TOP of the root certificate above the existing contents.

Point Sequel Pro to this file hen selecting the “Key file”. Leave other SSL options blank except for the checkbox enabling SSL.

If you do this wrong you will get an error like:

SSL connection error: ASN: bad other signature confirmation