If the adapter isn't appearing in your PG/PC interface, follow these manual steps:
Siemens SIMATIC PC Adapter USB Not Detected in PG/PC Interface Simatic Pc Adapter Usb Driver Windows 7
I can give you more specific troubleshooting steps based on those details. If the adapter isn't appearing in your PG/PC
For most modern setups, you don't need a separate driver download. If you have or later, the drivers are already included and should install automatically with the software. Simatic Pc Adapter Usb Driver Windows 7
For the latest official packages, you can check the Siemens Industry Support Portal for Pub ID 14690331. If you'd like, let me know: Are you using Windows 7? What is the exact part number on your adapter?