I can’t download chrome browser

iPhone 6, iOS 12

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

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

If you have an outdated iPhone that cannot be updated to iOS 13 or later, many apps will not be able to download.

Outdated iPhone no longer meets the requirements for many apps.

If you are talking about this app, compatibility iPhone -> requires iOS 15.0 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.

Why not? What happens when you try exactly?

The current version of Chrome for iOS requires iOS 15 or later. If you are indeed running an iPhone 6, it cannot run iOS 15, so cannot download Chrome.

You would need as mentioned above a newer iPhone.