I have been trying to build a ROCK for the past week but the .img.gz link has been broken every time I try.
Is this common? Is there another location I can get the image from?
Are you using the ROCK download link from …
see section 3 Download…
https://download.roonlabs.net/builds/roonbox-linuxx64-nuc4-usb-factoryreset.img.gz
Works for me (from the ROCK install guide)
https://download.roonlabs.net/builds/roonbox-linuxx64-nuc4-usb-factoryreset.img.gz