Interventi di Mary Cooch (personal account)

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Hello Steven. Yes the Moodle Teaching Basics program is for newbies with the editing teacher role, rather than your role which looks more like a non-editing teacher role. So doing all the courses is a bit of overkill. If you scroll down the Educator category you will see several courses on Assessment, for example Assess your learners and Assessment:Exploring Gradebook These might help, along with as you say, the grading bit of Moodle Teaching Basics.
The Academy courses are all on 5.1 so they will work for you. 
In the Frequently asked questions you have  a couple of answers to your question about reusing Academy courses on your site (short answer, yes)
 
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Thanks for promoting Mount Orange Shirley.
As for your options Steven I would definitely go for your suggestion of  a separate sandbox course where trainees are enrolled as non-editing teachers, with fake students pre-populated for them to grade?
Make a copy of a course (take one from Mount Orange if you want - use the Dean/Manager role because then you can backup student data) and make duplicates for all of your trainees so they have a course each to practise on Give them the non-editing teacher role.. They won't be confused by switching roles then.
(In the Moodle Academy Moodle Teaching Basics program there are suggested activities in Mount Orange to give learners practice grading and doing other activities.)
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You need to combine Restrict access with Activity completion such that once they have done one quiz they can no longer access any other quizzes. As a clue, read through the section Using restrict access -tricks and techniques
 
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Hello there. I remember that the 5.1 package was not available either - there is a tracker issue related to that version MDLSITE-8222 which mentions (quote) Our Windows packages are built on-top of XAMPP.

Unfortunately XAMPP has been abandoned and has not been updated itself in several yeaers. It only has PHP 8.2 and MariaDB 10.4.

Moodle 5.1 requires PHP 8.3, and MariaDB 10.11, so unfortunately it is not compatible.
so it might be that the same problem occurs with Moodle 5.2.