Are you downloading V15.1 to connect to a or are you using it for educational learning ?

This version introduced improvements to team engineering (Multiuser Engineering) and improved code generation speeds [1]. Best Sources for Siemens TIA Portal V15.1 Download (2021)

Have questions about Siemens TIA Portal versioning? Consult a certified Siemens System Integrator or visit the official Siemens Industry Support forum.