Finding a legitimate download can be tricky because Siemens has moved much of its focus to newer versions. Here are your primary options: 1. Siemens Industry Online Support (SIOS)
Siemens SIMATIC STEP 7 V5.5 is legacy engineering software primarily used for configuring S7-300 and S7-400 controllers, with downloads and service packs available via the Siemens Industry Online Support (SIOS) portal. While the software supports Windows XP and 7, users are often directed to upgrade to STEP 7 V5.7 for Windows 10/11 compatibility, or to TIA Portal for newer S7-1200/1500 systems. For more information, visit Siemens Support . STEP 7 V5.7 SP1 Programming Software for SIMATIC S7 / C7 Siemens Step 7 V5.5 Download