Yes, camera and guider work well. Ran all night and got this:

photos.app.goo.gl/wCBzZh8VZQG75XbF9

Impressed with the Duo, worked well even through an Optolong L-Ultimate filter, however I did have to do 3 second guide exposures.

It has a knob to adjust focus of the guider chip:

photos.app.goo.gl/rRtKEoC27AZyDkfp9

Seems to be very solid and works well. Next I will try it with my 10" Meade ACF on a Galaxy and see how it performs with a Long focal length telescope.

Telescope: StellarVue 102 Raptor
Filter - Optolong L-Ultimate
Camera / Guider - ZWO 2600 Duo
Mount - CEM120EC
40 x 200sec exposures

photos.app.goo.gl/NSJrR2wmPLLKhzuh6

WHOAAA! What a great shot!

David, you're using old KStars and most likely old INDI. You must update to a more recent build.

Doh!
TIL that my Astroberry was 32Bit - no wonder kstars did not update past 3.6.0.
I just reinstalled raspbian 64Bit and updated everything to the latest revision. I took it out last night to try it out and everything worked flawlessly.

I captured the Elephant Trunk Nebula in SHO, got around 2h of data for each filter (Antlia Ha OIII Dualband + Antlia SII). This is my result:

Pretty happy for the first light. Hoping to have some clear nights to come for further testing.

Gear used:
Raspberry Pi 4 (Raspbian, kstars)
Skywatcher ESPRIT 100ED
0,79x Reducer/Flattener
Skywatcher HEQ 5 Pro (Belt mod)

I had no problems guiding with 2sec exposures, even with the 3nm SII filter. I stayed in the 0.5~0.6" rms error range most of the time.

Are any of you who got KStars to work using Windows11? I've gotten the latest version of KStars, the latest ASI drivers, and latest version of StellarMate and I still cannot get my ASI2600 Duo to work. It's frustrating.

Dean, you have SM OS 1.7.8? Other uses with StellarMate reported success so what's going on in your setup? Did you isolate everything else and just connected this camera?

AH HA!!!! Found it!!
After consulting with a computer expert (aka my son) we were able to trace the problem to a corrupted download of StellarMate OS 1.7.8. I updated the OS just after I received my mew camera. Trying to connect my old Starlight Xpress camera yielded the same results as the new camera. With his help, I reloaded 1.7.8, confirmed the download, and put the SD card in the Raspberry Pi.
Viola! it works!!
This makes me very happy as I really like KStars. It, IMHO, is superior to other integration software. It's way more intuitive and has more functionality than NINA or Voyager.
Looking forward to some clear skies this week. Thanks for the support!!!