Need help with an "Unable to load addon script from path" error

Godot Version

Godot 4.4.1.stable.mono

Question

So, I have been trying for weeks to get the WaterwaysNET (v. 1.0.0) plug-in by Tshmofen Kasper Arnklit Frandsen to work and I keep getting the same error…

“Unable to load addon script from path: ‘res://addons/waterways_net/WaterwaysPlugin.cs’. This might be due to a code error in that script.
Disabling the addon at ‘res://addons/waterways_net/plugin.cfg’ to prevent further errors.”

I have been trying to track down an explanation for this error or any related error, but all I ever find are dead posts or “this is the same issue as…” that links to “see issue…” ad infinitum without anyone ever actually solving the problem.

I download it through the asset library, doesn’t work. I download it and install it independently, still doesn’t work. I check to make sure the language is C# in the Edit Plug-in window, still nothing. Reinstalled Godot just to make sure I had the correct version, doesn’t work.

At this point I’m more annoyed at the lack of an explanation than I am at it not working. I feel stupid because arbitrary problems usually have arbitrary solutions. Any leads on would be greatly appreciated.

Edit* I forgot to mention that yes, I have tried the Create C# Solution. All it does is give me the following errors…

ERROR: /root/godot/modules/mono/editor/GodotTools/GodotTools/CsProjOperations.cs:13 - System.IO.FileNotFoundException: Could not load file or assembly ‘Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’. The system cannot find the file specified.
ERROR: File name: ‘Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’
ERROR: at GodotTools.ProjectEditor.ProjectGenerator.GenAndSaveGameProject(String dir, String name)
ERROR: at GodotTools.CsProjOperations.GenerateGameProject(String dir, String name) in /root/godot/modules/mono/editor/GodotTools/GodotTools/CsProjOperations.cs:line 13

The plugin has an answer here GitHub - Tshmofen/waterways-net: A tool to generate river meshes with intergrated flow shader using Bezier curves for Godot 4.

My apologies. I have already tried that and forgot to put that on the list. I have edited the original post with the errors is throws.