Connecting to Google

Total newb to Linux and FreePBX.

I downloaded and installed the latest PIAF distro. (CentOS 6.5, Asterisk 1.8.25, FreePBX, on a PC.
I was able to set up a softphone, but when I try to set up Google for trunk, I select “Connectivity” tab and Google Voice(Motif), I get the message “This module requires Asterisk chan_motif & res_xmpp to be installed and loaded”.
I went to Module Admin and updated everything I could find.
I tried the asterisk-version-switch from the command line that I found online, but received “command not found”.

I’m stumped (of course).
Any help would be gratefully appreciated.

The earliest version of Asterisk that supports chan_motif is Asterisk 11.