Hi good afternoon please how do I update iOS in order to download some Apps

Hello ~ You can update to iOS 12.5.7 but no further. Click on the links below….

Update your iPhone or iPad - Apple Support

If your iPhone or iPad won't update - Apple Support

If you need a higher version of iOS you will need a newer iPhone. Click below to shop for a new device…

iPhone - Apple Official Site

If you purchase a second hand device please take a moment to read these helpful links by clicking on below to make an informed decision…

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Also:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

~Katana-San~

Your iPhone 6 is too old to update any higher. You will need a new iPhone if you want the higher updates.

Hello ~ For some reason I didn’t see your post…weird. I apologize my friend.

~Katan-San~

No problem, Katana-San. Sometimes the system hiccups.