Ah! Thank you @Hooverdan I’ve now created this new file path and placed the .json file there.
Updating has still had no effect but I now realise it might be to do with the fact that I can’t update from Rockstor 3.9.1
I may have done something this is stopping the system from updating. If I install a clean version of Rockstor and then immediately activate automatic updates should it update to 3.9.2-55 that I see on Sourceforge? Or is it a manual installation process?