Post: #2

Building

Project files can be build on Windows (VS, CMake, MinGW) and Linux (GCC, CMake).

Even using 64bit OS, Sphere must be compiled/executed in 32bit mode to work properly. Project files included on source code will compile it in 32bit mode by default.
Windows

Visual Studio (VS)

Open the project file SphereSvr.vcxproj using Visual Studio
On top menu, select the build configuration (Debug/Local/Nightly/Release) and click on Build > Build Solution to compile

NOTES:

VS > 2010 users: When opening SphereSvr.vcxproj for the first time it will request an update on project file, just click OK to update
VS 2017 users: VS 2017 have an modular installation, it comes with just basic components and extra components must be installed as needed. To use Sphere source you must open Visual Studio Installer to install Desktop Development with C++ workload and Windows Universal CRT SDK individual component
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Well, here it is well written, good instructions.
https://github.com/Sphereserver/Source