If the Red Giant Application Manager (RGA) is not letting you sign in, it's usually because:
- RGA needs to be reinstalled with its latest installer: Mac / Win
- This option should be tried even if RGA says it's currently up-to-date.
- You are behind a firewall
- You'll need to configure your firewall to allow RGA to accept incoming/outgoing connections. Consult with your firewall's documentation for steps on how to do this.