Nexus 4 verification failed error on Update Android 4.4 KitKat

I successfully downloaded Android 4.4 KitKat (see screen shot):

And after downloading do not appear "restart/install" button, appear "Verification failed" error (see screen shot):

^{(click the images for larger variants)}

If I click "Check now" button it begin redownload update Android 4.4 kitkat again.

Does anybody know where the problem is, and how it could be solved?

Answer

Is your Nexus 4 100% stock? (i.e. no Xposed module changes, or low-level tweaks like status bar mods and DPI changes).

Verification will fail if the system files on your device don't match factory/the expected ones. I had this happen to me several times with both my N4 and N5. Reverting the changes I made (thankfully, they weren't too many) fixed it.