Software download

The EFA software is a Windows application, designed to work on Windows 7 or higher. Click on the link below to download the setup.exe file. Uninstall any previous versions of the software, run the setup.exe file, and then follow the on-screen instructions:

EFA Calculator - Setup.exe (42 MB) (Beta Version (click here for zipped version)

The software requires the .NET framework to be installed on the PC. If it is not installed the installer will download and install it (thus an internet connection is required).

After installation, to run the software double click on the 'EFA Calculator (Beta Version)' icon on the desktop or select it from the Start menu.

NOTE: This is a Beta version of the software and so it may contain bugs and errors. Please report any issues to:

NOTE: Some elements of the QuESSA calculations in the software are still being testing and refined, so are likely to change in the near future.

Click here for a list of known bugs and issues.

Click here for release history.