Hi Steve
I am running a windows 2016 server I am an administrator of the server
I installed wordpress locally myself last year.
Just recently updated it manually to the latest version 5.6.1
I have downloaded and unpacked PHP version 7.4.15 and it is saved in the same folder as version 7.3.12
Not sure what you mean by Webstack
When I got to PHP website it’s instructions are for running an IIS server.