[Ritu Raj singh]

I am unable to install the update on my lumia 720 ,I am on build 10149. Update finishes the downloading and then shows some error telling try restarting the phone and try again. Suggest me some solution .

[Harrie-S]

It may be helpful if we know the error code.
But a slow/unstable wifi may be a rootcause or if you do not have enough internal memory.
And keep your phone connected to charger.