Ensure .NET 3.5 and 4.0 are enabled in your Windows Features.
: Avoid third-party "cracked" sites, as they often contain malware or corrupted setup files that can crash industrial PC systems. Quick Review Summary Pros Necessary for specific older hardware Severe OS compatibility issues (No Win 10/11) Low system resource usage compared to V19+ Lacks modern features like PLCSIM Advanced Stable for simple S7-1200 projects No longer receives security or bug updates Download Tia Portal V12 Sp1