Siemens occasionally offers 21-day trial versions of older software. Search for "TIA Portal V12 SP1 Trial Download" on the official site. The trial is fully functional but expires. You cannot extend it.
Installing V12 SP1 is notoriously finicky. Follow this sequence exactly to avoid registry errors. Download Tia Portal V12 Sp1
Siemens provides software to registered customers via the Siemens Industry Online Support (SIOS) portal. You must have a valid Software Update Service (SUS) contract or a perpetual license that includes the right to download that specific version. Siemens occasionally offers 21-day trial versions of older