Yes, unfortunately I have had the same experience that primalucelab does not respond to support requests. Very sad for such a company.
I have now been able to downgrade the firmware to version 1.3 and it looks like it will work again with indi.
I had to download the FOCUSER Manager and the ESATTO firmware 1.3. at the bottom of the page. This allows me to downgrade the firmware. eu.primalucelab.com/info/downloads.html