Launch the setup file you saw in the files you unzipped. This will install the Loader Software. Once it is installed, you will see it on your start programs listing. Depending on how you attach to your 990, you may have to install the USB driver.

Once you are connected, you will have to select the firmware located in the C:\Program Files\Outlaw Audio Model 990\Firmware folder. It should be 990_3_24.BIN