A: Only if you are doing historical research. The standard evolves rapidly. For example, the 2024 revision of 62443-2-1 added specific requirements for cloud-based control systems. Always buy the latest version.
You will never find a legal, complete, and up-to-date for free on a random download site. Cybercriminals use fake "free PDF" links to distribute malware targeting industrial engineers. Always use official channels. iec 624852 pdf