I also caught up with this 400 client error:bad request after replacing the scripts. I couldn't find version upgrade option in autofocus minemeld, can you share the link.
I am pretty sure there is none.
which version of MineMeld for Autofocus are you running? Is it possible that you are running on version 0.9.46?
If that's the case you can upgrade MineMeld by going to Apps, stop MineMeld and restart it. DO NOT RESET!!
It's always better to do a full backup of MineMeld before doing a restart (under the tab SYSTEM).
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