Mine didn't work either.
When you try to put the window down with the switch you will hear a click if the regulator doesn't work. If you don't hear anything it's most likely your switches. If you do hear alot, it's your cable
Regulator is pretty easy to change. Don't have to take out the glass or even
lower it. Just take off the bolts that hold the regulator to the door and the ones behind that hold it to the guides, remove the cable reel, take out the regulator, put the new one in, put the reel back in making sure the cable hasn't dislodged, put all the bolts back in and hey presto!
My advice would be to take a picture with your phone of the back of the regulator when it's in to find out where all the bolts are because it's quite difficult to see yourself!! Then feel around for them when taking them off.