I try updating my ios15 but I can’t select the install and download

Moses_Sark Said:

"I try updating my ios15 but I can’t select the install and download"

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To Check for Updates:

Use a Computer and Ethernet:

Start with attempting an update through use of a computer. If you cannot use Wi-Fi, then use Ethernet.  Go Here: Update your iPhone Using a Computer - User Tip. 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. If you get the same error, the model is likely just not compatible.

As shown in your screenshot: you need to connect to a Wifi network to complete the update.