If you can tell me the software context, I can give you the specific installation instructions.
For the most up-to-date and secure download, you should always refer to the official Siemens Industry Online Support page. Download v15 zip
This is official Siemens documentation for Siemens TIA Portal V15 and V15.1, allowing users to update their hardware catalog for PLC and HMI programming. Key Information: TIA_Portal_V15_HSP.zip If you can tell me the software context,
Includes support packages subject to export restrictions (requires login/export check). Download v15 zip
To make sure this is the right "v15 zip" for you, could you confirm if you are: Updating a project (as described above)? Looking for a 12d Model 15 installer? Looking for CAESAR II v15 installation?