I thought I will try to save you some time by letting you guys know that at least the parsing of events (i.e: Splunk CIM to get the fields out of logs) no longer works.
Not only that, but since it's doing transformations (changing the raw log as it gets indexed) the addon has become destructive: because the regex that it uses to parse fails, some data gets lost.
If you, like me, are looking for a way to get a quick CIM solution for ossec logs, I can attest this other app works for that (at least at the moment of writing): https://splunkbase.splunk.com/app/300
It is a bit overkill for the task since it provides much more. But if you don't touch the inputs.conf, it works as a CIM.