Steps, for those unfamiliar:
1) Log out of the Steam mobile app and change your password via the the desktop client
1) Download and install
FlyVPN (20-minute session limit)
TunnelBear (500MB data limit),
VPN Gate (no hard limits) or
VyprVPN (500MB bandwidth limit).
3) Connect to a server in Australia, New Zealand or Asia
4) Restart Steam (if you're logged in)
5) Unlock the game
6, optional) Switch to Offline Mode to preserve the "Play" button as it will revert back to "Pre-load" once you're no longer connected to the VPN (even if you disconnect mid-game, you won't be booted out)