Are you experiencing the iTunes error 0xe8000a ? There are several factors that can cause this problem such as an old Windows update, old iTunes software, outdated ...
Apple has posted a Knowledge Base article addressing an issue where users receive the error message: "Error -48 itunes unable to download your update at this time ...
The USB or the lightning cable you are using to connect iPhone with your PC might be faulty. You need to verify that and try connecting again after restarting the PC ...