how to download the latest ios?

Follow these instructions:

Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support

It sounds as if you may have an old installer file on your phone. Try this:

1. Step 1: On your iPhone, iPad, or iPod touch, go to Settings > General > Storage & iCloud Usage.
2. Step 2: Under Storage, select Manage Storage.
3. Step 3: Locate the iOS software download in the list and tap on it.
4. Step 4: Select Delete Update, and confirm you do want to delete it.

im on 10.2.1 iphone5 its saying latest version but 🔴 the updates there its not downloading or wont verify its like its if it feels like it its annoying iv deleted all my apps its kinda wishing i woz android coz its a joke & way to technical lol

good luck wiv yours

did following it help you

i think iv a bug but clueless how check