Unzip and go! Bundles are zip files that contain spinetoolbox.exe executable
and everything you need to run Spine Toolbox.
They can be unzipped anywhere on your system; no other installation steps are necessary.
The bundle also comes with a Python interpreter to help you get started. Note, that to keep the interpreter light-weight, it is missing some key components for serious work. A separate Python installation is recommended if you need a full-blown Python for your Tools.
For other installation methods, see Toolbox installation.