When installing if you get the
Unable to contact reliable source…
If you have the HAWKEN launcher icon on your desktop:
Right-click and choose “Open File Location.”
From here you can delete the HAWKEN.version file.
If you do not have the HAWKEN launcher icon on your desktop, the default path to this file is below.
Start -> Computer -> C drive -> Program Files (x86) -> MeteorEntertainment-> HAWKEN-> InstalledHawkenFiles -> Hawken.version
After you deleting this file, open the launcher and sign in. The game should then patch to the most up to date version.