Siemens removed the V12 trial download after V13 was released. However, if you have an old download link from a registered email, you might still access it.
As of current reports, by Siemens.
If you downloaded the files, you likely have several .exe and .001 , .002 files. Run the .exe to extract the installer to a temporary folder. tia portal v12 sp1 install download
Q: How do I obtain a license key for TIA Portal V12 SP1? A: You can obtain a license key from Siemens or an authorized distributor. Contact Siemens support for more information. Siemens removed the V12 trial download after V13