Unfortunately (for me) the version you're hosting is the 32-bit version. The application will not run in a 64-bit environment.
Please update https://winscp.net/eng/download.php#putty to reflect that the version you are hosting is the 32-bit version. Maybe something like (bolded to highlight the difference, not actually for the web page update):
Executable (32-bit, 0.5 MiB)
Installation package (32-bit, 1.8 MiB)
P.S. And THANK YOU for your ongoing work on such a useful universal file transfer program. I'll go donate right now!