If your computer is on a network that has a firewall and you receive an HTTP error message trying to install or validate a license,  follow the procedure below.

1. Navigate to the folder, "C:\Program Files (x86)\eTakeoff\RView\Firewall Helper"

2. Copy the firewall helper file, "eTkoFWH.dll"  to the "C:\Program Files (x86)\eTakeoff\RView" folder.

3. Install the license or open program.