Failure to Install Update onePLUS One

I've had an issue with installation of CM update < cm-12.0-YNG1TAS2I3-bacon-signed-fastboot.zip >.
I've tried pretty much everything; so I placed the file in the DOWNLOAD folder on the OPO.
Booted to Recovery
Went to the DOWNLOAD folder
Clicked on the <cm-12.0-YNG1TAS2I3-bacon-signed-fastboot,zip> file.
It appeared to start the install; but ended with the following message:
"Install failed
Finding update package...
Opening update package...
Verifying update package...
E: footer is wrong
E: signature verification failed
Installation aborted."

Short of attempting to do a FULL CyanogenMOD fastboot flash; are there some suggestions about how to resolve the issue>

FWIW: When I fastboot flash recovery TWRP-2.8.7.0-bacon.img it installs; but after shutting down the OPO and restarting it a a later time, If I close down to "Recovery Mode" the OPO has reverted to the stock recovery UI. :(