The SINUMERIK 840D sl STEP 7 Toolbox V17 is an essential option package for the Siemens TIA Portal V17 Go to product viewer dialog for this item.

Error: "Installation failed at 90% - Access denied"

Solution: You forgot to run as Administrator. Also, check Windows User Account Control (UAC) settings. Set UAC to the lowest level and reboot.

If you want, I can:

Why You Cannot Skip the Toolbox

Attempting to program an 840D SL using a vanilla version of TIA Portal V17 is futile. Without the Toolbox:

PLC Basic Program: Automatically installs the SINUMERIK 840D sl PLC Basic Program system library, supporting firmware versions from V4.5 to V4.95.