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

1. Navigate to the folder, "C:\Program Files (x86)\eTakeoff\RView\Fire wall helper"

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

3. Try to install the license again.