After playing about with NLD mod in response to original question.
I don’t think it’s worth it.
I wouldn’t use it for downgrading as encountered issues and DUMLdore is easier and works.
It’s handy for quickly changing parameters but you can do that in older version of assistant, just not with a nice UI. You need an old version of assistant to use NLD anyway.
For IOS you need to downgrade your app to 4.1.3 and it has no options to modify for FCC etc. Downgrading is a bit of a pain.
For android you can create a custom APK in the app with FCC mode etc, no fly zone disable, no wind warnings etc but you can’t select them individually, it’s all or nothing.
Basically you can do everything for free with a little research.
What annoyed me is they advertised 24hr live chat for technical assistance.
When I had problems live chat was unavailable, and had to email, will see how long it takes to get a response.