There isn't yet a global redirection feature that automatically redirects any arbitrary HTTP request to HTTPS, but there is an easy to way ensure that all authentication requests and all operations subsequently performed by authenticated users are via HTTPS.
What you need to do is edit the file, C:\ProgramData\Enterprise Distributed Technologies\Complete FTP\Login\index.jss.
The second line of the file is
var forceHttps = false;
Change this to
var forceHttps = true;
This will force all authentication requests to be submitted via HTTPS and, since users can only log in via HTTPS, they'll only be allowed to access their files via HTTPS.