Automatic update process on Nexus 4 after downloading file

I have Nexus 4 and I got an offer to update to Android 5. I started the process and the downloading of file took a long time so I decided not to continue with updating immediately but next day. Next day, unfortunately, my phone has restarted and I lost the option to continue with update. Android update check informs me that version of my Android is 4.4.4 and it is up to date.

Do you know how can I continue with updating of my device? Is there a file downloaded that blocks update service to see current state and offer updates?