Key takeaway for you: You have TIA Portal V17 Professional or HSP (Hardware Support Package) capable already installed. The Toolbox won't work with an older or incompatible version.
: Automatically installs the SINUMERIK 840D sl PLC Basic Program system library, supporting firmware versions from V4.5 to V4.95.
Maintenance engineers, PLC programmers, and commissioning engineers working with Sinumerik 840D sl (Solution Line) and TIA Portal V17.
Simplified integration of the basic program (blocks like FB1, FC2, etc.) into your project.