Install

I appreciate you giving us an update, QucBk_desktop_developer.

As mentioned by my colleague, we have a dedicated forum designed to assist you with API-related questions. You can connect there with highly skilled developers specializing in Firewall configuration as well as getting the list of port numbers and IP addresses. 

The steps provided by my peer above are correct. You can just escape step 2 and go to this Intuit Developer page, then directly proceed with selecting QuickBooks Desktop. I'm adding a screenshot for your visual reference.
 

It's a great platform to seek guidance and collaborate with experts in the field.

You can always get back to this thread if you have other questions aside from developer-related questions. The Community is here to help.