I have updated my phone to iOS 15.5 but when I want to download it keeps showing “THIS APPLICATION REQUIRES IOS 14.0 or LATER”

You have not updated to iOS 15.5

Update your iPhone, iPad, or iPod touch - Apple Support

Hi Mafor1,

Welcome to Apple Support Communities!

We understand that you're attempting to download an app, but the app doesn't see that you already have the latest iOS installed.

To help isolate this behavior further, we'd suggest that you disable Low Power Mode, restart your iPhone and attempt to download again. You can go to Settings > Battery to disable Low Power Mode: Use Low Power Mode to save battery life on your iPhone or iPad - Apple Support

When Low Power Mode is on, your iPhone or iPad will last longer before you need to charge it, but some features might take longer to update or complete. Also, some tasks might not work until you turn off Low Power Mode, or until you charge your iPhone or iPad to 80% or higher.

Low Power Mode reduces or affects these features:

• 5G (except for video streaming) on iPhone 12 models1

• Auto-Lock (defaults to 30 seconds)

• Display brightness

• Display refresh rate (limited up to 60 Hz) on iPhone and iPad models with ProMotion display2

• Some visual effects

• iCloud Photos (temporarily paused)

• Automatic downloads

• Email fetch

• Background app refresh

In the meantime, iOS 15 includes the Translate app. Check this out: Translate text, voice, and conversations on iPhone

We hope this helps.

Cheers!