While this specific installer was commonly used for older environments (like Windows XP or Windows Server 2003), it has largely been superseded by modern web clients on Windows 10. Overview of TSWebClient
Since you are on Windows 10, you should use the built-in or modern equivalents rather than searching for this legacy .exe : tswebclient-en-setup.exe windows 10 download
Contact your software vendor or system administrator – tswebclient-en-setup.exe is not publicly distributed by Microsoft. While this specific installer was commonly used for