Learning Lab: sharing your custom courses now that they can't be "published"?

A couple years ago, my team developed Learning Lab courses for onboarding new members to some of our data processing pipeline development practices. They were developed under our organization. Not everyone we shared these courses with were members of the organization and it was very convenient to send a link to the published course and have them take it.

A few months ago, I started to develop a new version of these to teach a new primary pipelining tool. The “Publish this course” button is now gone and there is a message about Learning Lab no longer publishing any courses developed outside of GitHub. I am wondering what I do now? What is the best way to share a link to this course that will work even after the course updates? Also, is there a way to share with people that are not added to my organization? My course admin page says that the course visibility is public, but I can’t seem to get the links to work for colleagues.

This was a surprising change in permissions for creating GitHub Learning Lab courses and now that I have finished, I am scrambling to make them available as quickly as possible. Thanks for any advice you can provide!