|First, go on the internet and download the manual for the device. If Linksys doesn't have a manual for that product, there should be a "quick setup guide".|
Once you have that, power the unit up. Then grab a pen and use it to push in the "reset" button the unit. Press and hold the button in for 10 seconds......then release.
This will reset the device to factory defaults. Then, use the manual/guide to find out what the default IP address of the device is and login to it with your web browser to set it up.
I don't know why the ship those SOHO routers with "software" myself, none is needed.