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A common "broken" aspect of fresh installs is the . If your download doesn't "work," it’s often because the communication drivers for PC Adapter USB or Ethernet (ISO/TCP) failed to initialize. A "fixed" installation routine involves clearing the "S7EPCAPI" logs and reinstalling the Simatic Net drivers included in the SP2 package. Steps for a Stable Installation
If you need to test more current versions, Siemens offers a 21-day trial for STEP 7 V5.7 SP2 which includes modern security and OS support. simatic step 7 v5 5 sp2 download fixed work
Run Setup.exe (as set above).