Locate the downloaded file on your computer. If you did not get to choose a location, check your downloads folder.
Using the included micro-USB cable, connect your Quattro to any USB port on your computer. Detach the microphone module (if equipped) and move the switch on the back of your Quattro to the + position.
Navigate to the folder containing the download. Using your mouse, right-click on “Quattro 4.0 Firmware Upgrade Kit.zip” then left-click “Extract All”.
Select the option to “Show extracted files when complete” and left-click “Extract”.
Double click on the "1. Run Me First!" file and let the program complete it's install.
Once Step Five is complete, double click the "2. ClearSounds Updater" file and follow the on-screen instructions.
On Windows 10 you may get this error/popup during Step 7 and 8. If you do, click on More Info then Run Anyway as seen in the screenshots below.