As suggested above, try to join us on slack it is much easier to provide live help there than on forums.

Now technically the documentation to compile the code base for Windows may have worked several years ago in previous forks but since it has not been updated, as you noticed, the procedure is merely not applicable anymore "as-is". Systems and all tools in the chain, constantly receive updates. The code base itself received updates (from an autoconf build to qmake etc...), you will need additional steps to install dependencies that were either provided by default before and are now available only as adhoc installs...

The Magnet QT wallet for Windows is compiled using MXE (M cross environment) on Linux, and that's probably the easiest way rather than trying to get a functional toolchain on Windows.

We are planning to update the docs to compile under the various systems (windows, linux, macos) as time allows but in the meantime I encourage you to join us on slack - glad to help anytime there!