There are two types of developer licenses that can be used for non-production development and testing use cases:
50GB Personalized Dev/Test licenses are available to users associated with accounts with a paid Splunk Enterprise or Splunk Cloud license of any size and can be requested here: https://splunk.com/dev-test . These licenses do not allow clustering, among other restrictions.
I am using a DEV licens and I am also using it as a dev before going into production.
I am using SH-Cluster, and mine is working.
When did this stop?
In the readme faq, it only says limited usage and.