You'll want to set a DAWNSBURY_DAYS environment variable to point at where the game folder resides (where the .exe and CREDITS.txt are, no trailing backslash).
You can then open the Visual Studio (regrettably, it would seem like it has to be VS2026 because of .NET 10) and build the project.
The post-build step should copy the DLL from bin to the game's CustomMods folder,
but if it doesn't, you may have to do so by hand.
Post-build step will also attempt to update the DLL in the export folder that contains the files for publishing on Steam Workshop.
Mods by YellowAfterlife
Check individual mods' READMEs for mod-specific notes!