System update from android lolipop to marshmallow

[AC Question]

I checked for the update it was available so I downloaded it. I hit install and my phone restarted. After the restart I got a message that the install was interuppted and could not install. How do I get it to install?
Please help ''i have enough space on my xperia c4 ''for about 5 gbs!

 

[B. Diddy]

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