There is no official portable version of the full Microsoft Visual Studio 2015 IDE. Unlike its lighter counterpart, Visual Studio Code, the full 2015 IDE is deeply integrated into the Windows OS, relying on specific registry keys, GAC (Global Assembly Cache) entries, and shared system components that cannot be easily moved between machines.

PortableApps & Community Forums: Discussion threads on platforms like PortableApps.com function as technical white papers for the community. They detail the "shimming" process required to redirect file paths and registry keys to a local folder. Key Technical Challenges Addressed in These Papers

While Visual Studio 2015 Portable offers many benefits, it also has some limitations, including:

If you only need the compilers and build tools (without the visual interface), you can use the standalone Visual C++ Build Tools 2015. Portable mode - Visual Studio Code

Benefits of Using Visual Studio 2015 Portable