Why I can not download anything on my iPad 4 it's keep saying not enough update . How can I get iOS 11 or more on my ipad

Whether or not you are able to update your iPad to a newer version of iOS/iPadOS will be dictated by your iPad model - and the currently installed version of iOS. You can find this information here:

Settings > General > About

Not sure which iPad you have? Identify your iPad model.

Here is a list of the highest version of iOS supported by the older models of iPad (for simplicity - “generations” are shortened to a number) that are restricted in their ability to be updated:

iPad1 - iOS 5.1.1

iPad2, iPad3 and iPad mini1 - iOS 9.3.5 (WiFi Only models), iOS 9.3.6 (WiFi & Cellular)

iPad4 - iOS 10.3.3 (WiFi Only), iOS 10.3.4 (WiFi & Cellular)

iPad Air1, iPad mini2 and iPad mini3 - iOS 12.5.1

Newer models, not appearing in this list, are all able to be updated to the current version, iPadOS 14.4.

The tags appended to your post suggest that you have an iPad4.

Update support for iPad4 ended September 2017. The final iOS releases for this model were iOS 10.3.3 (WiFi Only models) and iOS 10.3.4 (WiFi & Cellular). iPad4 cannot be updated to any later major version of iOS as it lacks the minimum hardware requirements needed to run more recent versions. The 32-bit platform upon which the iPad4 is based is obsolete.

Many App Developers have also dropped support for older devices and iOS versions preceding iOS11/12/13 - and have withdrawn older versions of their Apps from the Apple App Store. Withdrawal of Apps supporting older models of iPad is making their utility and usefulness significantly more limited. Once compatible versions Apps are withdrawn, you’ll not be able (re)download or (re)install them.

If Apps that you need to use now have higher minimum iOS-version requirements, your only option is to replace your iPad with newer model. Of current models, even the entry-level iPad8 supports current iPadOS 14 - and has hardware specifications and capabilities that vastly outperform your old iPad4.

I hope this information is helpful - if only in clearly stating the limitations of your iPad4 and your available options.

You don't.

A 2012 iPad 4th gen is forever stuck with iOS 10.3.3/10.3.4.

If you can, try and return it and get your money back.

That iPad is nearly 8-1/2 years old now.

If you are going to purchase used iPad models, purchase one that is much newer and up to date with iOS ( now iPadOS ), like any iPad model made from 2014 and later, like,

2014 iPad Air 2

2015 iPad Mini 4

2017 iPad 5th gen

( the first three iPad models above DO NOT support ANY Apple Pencils )

2018 iPad 6th gen

2019 iPad 7th gen

2015-2017 iPad Pro models

(All of these iPad midels support the 1st gen Apple Pencil )

ALL of these listed iPad models will support the current iPadOS 14.4.

Also, make sure you do not get stuck with an older, used iPad with user activation lock.

A properly “reset for sale” iPad will power up with an animated, multi language, “Welcome” screen.

If purchasing an iPad online, ask the seller to provide multiple images/photos of the animated, multi-language, “Welcome” screen ( these images should all be different ) or even better, a short video showing the actual, entire “Welcome” screen amination.

Sorry & Best of Luck to You!