iOS 14.7

Hi, I was wondering if anyone could help me. I have an iPhone 8 and I’ve never had any problems with it, until now!

For some reason, I am unable to install the latest iOS. I have tried with my phone fully charged, still plugged in and charging, over wifi, through my mobile data, I have turned my phone of and off and I have also freed up some more space on my phone. But for some reason it still won’t let me carry out the update, it instead comes up with this error message (picture attached). As you can see from the photo my phone is currently charging and is connected to a strong wifi. I have tried to update it for a couple of weeks now and it just isn’t having any of it.

Does anyone have any ideas as to why this is happening? Or I should say not happening!