Scripts stopped working -- v1.26-->v1.42

Hello…first time posting. I have looked in the forum and done a lot of searching online – but am still uncertain of the issue. Thanks for reading.

I’ve been using Siril 1.24/1.26 and was able to modify some scripts so that I could use Lights and Flats but no Darks or Biases.

Then I upgraded to 1.4 and the scripts failed. Rather than figure it out I reverted back to 1.26. But now they don’t work there, either.

So, back to 1.4. I have tried to modify some of the scripts to not use Bias/Dark but I always get an execution error.

The Lights and Flats (*.nef) get converted to *.fit files and placed in the /process folder. Below are the final few lines of the log.

My starting point has been this script: OSC_Preprocessing.ssf.
I also used this tutorial: Siril - Full image processing (pre-processed with scripts)

Thank you.

15:03:34: Saving FITS: file ../process/light_00003.fit, 1 layer(s), 8288x5520 pixels, 16 bits
15:03:34: Conversion succeeded, 7 file(s) created for 7 input file(s) (7 image(s) converted, 0 failed)
15:03:34: Execution time: 1.44 s
15:03:34: Running command: cd
15:03:34: Setting CWD (Current Working Directory) to '/Users/dob/nikon/2026_0417_C2025_R3/process'
15:03:34: #preprocess light -dark=dark_stacked -flat=pp_flat_stacked -cfa -equalize_cfa -debayer
15:03:34: Unknown command: 'preprocess' or not implemented yet
15:03:34: Error in line 22 ('preprocess'): unknown command name.
15:03:34: Exiting batch processing.
15:03:34: Setting CWD (Current Working Directory) to '/Users/dob/nikon/2026_0417_C2025_R3'
15:03:34: Script execution failed.