phone; i9100 maguro galaxy nexus. From CM, I got a message stating a new update was available: the CM11. I accepted. The update failed to install. Now on reboot the phone enters CWM Recovery mode. BUT IT WILL NOT CONNECT TO MY PC TO ENABLE ME TO TRANSFER ANY ZIP FILES to my phone, and so I cannot install any older CM10 versions. HOW TO CONNECT THE PHONE TO PC IN CWM RECOVERY MODE?
You could give adb a try, and use
adb push </source/on/PC/file.zip> <target/on/Nexus/file.zip> to transfer the files.
I you don't have ADB installed on your machine yet, and don't want to install the full SDK, take a look at Is there a minimal installation of ADB? Also, for more information on ADB, there's always our adb tag-wiki as a good starting point.