I cannot set up the WebDAV protocol on Windows 7. Why?
Windows 7 uses an old SSL3 protocol by default which is considered insecure by today's standards and it is disabled on Koofr servers. In order for the WebDAV protocol to start working you need to enable TLS 1.1 and TLS 1.2 as default secure protocols in WinHTTP in Windows. Click on the Microsoft instructions for explanation and fix.
After you perform the fix, you must reboot your computer.