To download or repair synsopos.exe, you should not download the file individually from third-party sites, as it is a core component of the Steinberg eLicenser Control Center. Downloading it from untrusted sources carries a high risk of malware. Official Download Guide
Never, ever download synsopos.exe from:
Warning: Proceed with Caution
If you already have this file on your computer (perhaps from an old POS system installation), don’t panic. Run these checks: synsopos.exe download