I also attach a screenshot of the additional data error in the last screen of the setup wizard
The link you provided is working, my browser is a little bit fussy and I had to use https, like in www.indilib.org/jdownloads/Mac/gsc.zip
I attach a screenshot of the GSC problem.
I just installed Kstars 3.5.8 on an Apple Silicon running Monterey.
Using the setup wizard, I tried to install the GSC but it didn't install it. I clicked on the link that shows on the wizard screen but it links to a non-existent page on Google: drive.google.com/file/d/0B_ivMJINsdQ8cDh...Z0E/view?usp=sharing
I also tried to install additional data in the last screen of the setup wizard, but it failed with a message:
Loading providers from file: indilib.org/jdownloads/knewstuff/providers.xml failed.
But the point is that I manage to download the file manually
Any idea about this issue? Is it a bug?