Must I want a wifi connection to download software updates

UUpadhya Said:

"is it must to have a wifi connection to download software updates"

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Updating an iPhone Via WiFi-Only:

No. Ethernet can be an option...

Update Using a Computer and Ethernet:

Try updating via a computer. Use my User Tip: Update your iPhone Using a Computer - User Tip. Using Ethernet: If you cannot use Wi-Fi, then use Ethernet. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple

With an iPhone 6S plus, you either need a WFi connection or a computer to update your phone.

Yes