I just downloaded the indi-3rd-party drivers from GitHub, compiled and installed (latest Ubuntu on old laptop), and afterwards I was able to select the SV905C camera.
Still crashed though as soon as I tried to connect, with the error that the SV305 driver crashed.
Apparently some people get the SC905C to work, but for some reason I cannot. Crashes at the very first instance, log file doesn’t say much. Still another 25 days to return the thing to Amazon, unless I solve this.