The ISO file is typically distributed by Siemens as a which allows users to test the software for a limited period (usually 21 days) before requiring a valid license.
You can find official downloads and detailed technical information on the Siemens Industry Online Support (SIOS) portal. SIMATIC_STEP7_V57.iso
is the disk image file for the Siemens SIMATIC STEP 7 V5.7 software package. It is the primary engineering tool used to configure and program Siemens SIMATIC S7-300 and S7-400 controllers. Key Details File Size : Approximately 2.4 GB . The ISO file is typically distributed by Siemens