Error when upgrading Android 4.3 to 4.4.2 on Nexus 7 (2013) tablet
EDITED 01/30/2014

If you clear the data for Google Services Framework, you can force the OTA update to start again.

There are a few downsides to this, but with a brand new device, you can safely clear the data and perform the OTA update.



Old Answer...

As deailed in this question, you can download the 4.4.2 image directly from Google and install it on your tablet from your computer.

One method is to use Fastboot:

If you're using Windows, you'll need USB Drivers (official link, and easy mode link, Koush's Universal Driver). The file downloaded includes instructions, which basically boil down to...


Reboot into Bootloader/Fastboot mode.
Connect your device to your PC with USB.
Run the appropriate flash-all file for your Desktop OS (Windows .bat files and Bash .sh files are included with the downloaded Android image). 


Note: This will also erase all data on your device. Make sure you back up whatever you want to. If I remember correctly, there's a flash-base or similar option that will not erase your data, instead of flash-all.