Please note that you should use the .WEB version via a web browser for updating firmware.
If using the .EXE version, then you need to have static IP address on the computer which the update is done from.
The .EXE firmware can also be used to recover the router if it is not responding or corrupted.
Please follow the steps in the guide "How to Recover Router" which can be downloaded under "setup guides".
This guide is also included with this download.