The last update was last week actually (support for those "alternative" certificates you can pull now along with the "default" cert). It's on the beta branch and to be merged to master soon, after which it will go to CPAN and will be updated for Windows binaries and Docker. There is also support for ACME EAB in the works - actually it is working, though I'm yet to find time to talk to the current ZeroSSL support to understand the specifics of the implementation for some edge cases for example
So the client is getting updated and there are no plans of stopping doing so. I hope that helps. Thanks.
NB: Also @Osiris is correct - Crypt-LE client was and is a separate project with a completely different codebase from the one that was used for the web-based client and the site (I believe I mentioned that in the announcement related to ZeroSSL being acquired at the time).