The update that came out yesterday 2/7 will not download. It says wait for Wi-Fi which I have tried on 2 different networks. I have tried without and it does not work. It gets to about 15 megs of update and then stops and give an error and says to contact game developer if problem continues.
Contact the help Center from the link at the button of this page. What type of device and what is the version level ?
My Android devices had no trouble with the update process !