Need help installing Ring Alarm devices

Sorry if this has been answered previously, but after watching the videos, reading and rereading the instructions, I'm still unable to finish installing.Basically, I purchased a Ring Alarm about four years ago, and had it installed for about two months, before we moved. Now I've finally gotten around to installing it again, but all I've been able to do is connect the base station to our wifi. Specifically, when I try to install the Range Extender, it's not found, so it can't be paired. And when I try to add the Keypad, not only is it not recognized, there's **no battery light at all.**If anyone has any suggestions, it would be much appreciated!