Thanks very much, Marcus.
We've installed the plugin and seems to working great!
Did you manage to export the feedback from the marking guide?
I've installed the plugin on Moodle 3.3, I can see it in plugins. But can't find where to actually export the csv file with the grades and marking guide feedback.
In the assignment administration block > "Export marking guide grades".
Thanks. I found it under the gear cog icon.