Hi Stefan - thanks for posting that. In fact, this is the version I had installed when I did my upgrade to Catalina on my MacAir and my MacBookPro - and the J4 did not work after the OS upgrade. I have been using this version since it was released in 2016 (on all 3 computers) and that is what is left running now on my MacPro, which is still on Mojave.
But your post got me to thinking that maybe the software was simply un-installed or disabled during the upgrade by the OS and that was why it wasn't working. Following your post, I did a re-install on the Catalina MacBookPro this afternoon (Sunday) which went fine and I re-booted and plugged the J4 back in and, low and behold, it was in the drive list.
I opened a few folders - so far so good. I located a folder of about 7GB of video recordings on my 20TB LaCie RAID and initiated a copy from the LaCie to the J4 to further check and see the transfer speed. I got 1GB into the copy and my LaCie RAID went into recovery with disk 3 (of 5) down.
The LaCie has gone into recovery mode now and it's re-building the array. A process I expect will take into Monday. I've pulled the J4 from the MacBookPro Catalina system at this point.
So was this a co-incidence ????; or is there a possibility that the J4 kernel extension somehow conflicted with the other RAID.
I have no way of knowing at this point - so all I can do is let the re-build take place - and I won't monkey with it until it is clear and I have reviewed my backup status of the LaCie RAID. I've also ordered a replacement 4TB IronWolf drive just in case disk 3 really was flaky. I did replace 1 drive in this raid in mid-2017 so it's possible.
In the meantime I can re-install the driver on the MacAir and retry the J4 - safer since the MacAir doesn't have any other drives connected to it.
I'll report on these activities a little later in the weerk.
In the meantime, I'd appreciate any other feedback on your installation confirming it is still working fine and you haven't noticed any anomalies on your system.
Again, thanks for the tip.
regards, jc - Sunday 3pm, Toronto time.