Probably due to the transition but i found some of the Bigfix courses are no longer reachable on the Security Learning academy site.
Bigfix Platform Advanced Topics
https://www.securitylearningacademy.com/course/view.php?id=807
And there was a whole Content Development Series which is not accessible.
https://www.securitylearningacademy.com/course/view.php?id=305
Is this going to be migrated to HCL website or gone for good?