VS 2019 "cannot find setup engine instance"

[moondaddy]

I've been using VS 2019 Enterprise with no problem. Yesterday I installed the new version of SSMS 18.4. Now in VS 2019 when I attempted to install and extension but was prompted to update the VS installer first. OK I ran that which seemed to go OK. but when continuing with installing the extension I get the error I get the error "cannot find setup engine instance".

Any help would be great. thanks.

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