Geometry-Dash-Multiplayer/GDM-Windows ? reverse-engineered prompt

Build me the Windows client for Geometry Dash Multiplayer from this repo, so I can open it in Visual Studio and run it on .NET Framework 4.6.1.

I want the app to launch cleanly on Windows, connect the pieces in the solution together, and include whatever is needed for the multiplayer client to work with Geometry Dash. If there are any setup steps, missing references, or build issues, please fix them so the whole solution compiles and starts without me having to dig around.

Please keep it compatible with older Windows machines, since that seems to matter here, and make sure any injector or helper parts included in the repo are working too. If you need to check current docs or confirm something about Visual Studio 2019 or .NET 4.6.1, go ahead and look it up online. I mostly want a working multiplayer client that matches the project in the README and can be built from the solution as is.