I want to download ios 14.0

Unfortunately, your iPhone 6 cannot run iOS 14. iOS 12 is as far as it can be upgraded as it lacks the components to run newer software.

Sorry, iPhone 6 cannot run iOS 14.

The best that the iPhone 6 can do is iOS 12.5.7, which you probably already have. I would not look for any more updates for the iPhone 6.

I want to download iOS 14.0

I need update software