Android N and how to delete a downloaded version

[AC Question]

Hi, I downloaded Android N onto my Nexus 6 and when I went to install it it plainly states that it is not for daily use and I want to delete it but can't find it on my phone. I don't want to factory re-set my phone as that would then take me a long time to re-install everything and download and install the Android version updates. Does anyone know where this file is stored so that I can connect to a laptop and just delete it as it seems to be blocking security updates that Google is sending out, I just got one for my Nexus 5 yesterday.

Regards and Thanks

Matt