Step 1: Click to download this file: ERBSecureBrowser_220.127.116.11.zip
Step 2: Open Finder, locate the downloaded zip file on your computer and double click it to extract the application file.
Step 3: You will now see another file called 'ERB Secure Browser'. DO NOT DOUBLE CLICK THIS FILE. Drag this file into your Applications folder as shown below.
If you are prompted with the screen below, click 'Replace'.
You may delete the original .zip file once you have moved the 'ERB Secure Browser' file to your Applications folder.