When downloading the "best" package (usually the Complete version), you are getting:
Siemens does not offer TIA Portal for free. Searching for a "free download" of V15.1 usually leads to malware, ransomware, or bricked PLCs. best 2021 download siemens tia portal v151
Siemens offers TIA Portal exclusively through the Siemens Industry Online Support (SIOS) and the Digital Enterprise Store. To download V15.1: When downloading the "best" package (usually the Complete
Warning: As of 2025, Siemens has moved V15.1 to the "Legacy" section. You may need a registered account to access it. Warning: As of 2025, Siemens has moved V15