Symptoms

K2.com 4.6.11 Installer Package USA download link blocked.
 

Diagnoses

Error message: "The page you've been trying to access was blocked. Reason: The service is unavailable, please try again later." - Secure Web Gateway provided by Trustwave. The download was working from Support's side.
 

Resolution

Download package from 'Africa' region was working. Confirmed that the installers are identical, the difference being the server location for faster regional downloading.