Help. 4.4.4 update fail

[naullsy1985]

When I go to update my phone I get a message saying 'couldn't install new software please try again later'.
Any one know why? And how I can fix it. Tried updating on WiFi, 4g, and also tried updating using Pc companion but still no good. Please help
Using a xperia z1 compact

 

[B. Diddy]

It's possible that the servers are busy. How long has the error been coming up?