WP8.1 GDR1 - update downloaded couldn't be opened

Yup downloaded without any problem but Cortana alpha is not as cool as beta version and my phone is lagging a bit
Lumia 920 wp8.1 gdr1 Lumia black
(India)
 
Battery less than <50%
charging now to see if it's that!
I had set phone to US for a few weeks to try out Cortana, but switched back 3 or 4 weeks ago, to UK.
trying to think of anything unusual about my phone...
 
Another 925 DP, no Cyan. Got error, trying again now. Installed w/o problem on 928
 
Same problem here.
Downloaded but during prepping installation got 8018830f error.
Lumia 925 Cyan Italy
 
I'm also getting error code 0x80188308 on Lumia 920 with Nokia Black Firmware. Free space is over 6gb, network is EE UK. OS version is 8.10.12397.895
 
Also getting error code 0x80188308 on Lumia 920 with Nokia Black Firmware. Free space is over 8gb, network is Eo2 UK.