Thanks for all your comments, I'll be seeing what I can do very soon.
Andrii - wasn't sure what you meant by version number - of what? SSRS 2019 is 15.0.1102.675 and I may as well run it from VS2015 I've been using already which is 4.7.02053.
Scott - I guess I'll find out what that all means once I dive in!
Steve and Feridun - thank you, I've taken it on board and hopefully can crack on soon.
Wishing you all as good a Christmas as possible (I'm in Tier 4) and may 2021 be kinder all round.
I'm sorry for the confusion, my message was not clear enough.
You will have to use VS 2015 to develop reports because this is the highest version that supports FetchXml Authoring Extension that is used during the development of reports to gather data from the system.
With 8.2 and 9.0 I meant versions of FetchXml Authoring Extension.
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