Setup.exe version 6.4.x.x).. This version allows for the creation of safety-oriented user programs in SIMATIC S7 CFC up to SIL 3. Download and Versions Main Version (V6.4): Released in September 2021. Service Pack 1 (SP1):
Request a time-limited trial license for migration purposes. They sometimes provide old versions if you have a current support contract. S7 F Systems V6.4 Download--
It sounds like you are looking for the S7 F Systems V6.4 software, which is Siemens' safety engineering package for configuring fail-safe automation systems (like ET 200S, ET 200pro, or S7-300/400 F-CPUs). Software Name: Siemens SIMATIC S7 Flexible 2008