Iphone 6s Version Update ERROR

I try to version update from 9.3.4 to newest version on my iPhone 6s, using original cables, on iTunes PC application. I can connect to my device on application and it asks me if I want to update to newest version. I accept it but an unknown error occur just after I press download and start install. Error code seems like (-23) on pop-up error screen. Also I know that I have enough space to install new version.