My phone Instagram not download please help

iPhone 6, iOS 12

iOS 12.5.7 is the latest iOS security update for iPhone 6.

Go to Settings -> General -> Software Update -> Download and Install (if you haven't already done that).

iPhone 6 can’t be update to a higher iOS (13 and later). 

Sorry it is not possible, Instagram requires iOS 13.4 or later.

Most apps require iOS 13.4 or later.                                

Considering a newer type of iPhone?

Read this before you buy a newer type iPhone.