How do you update iOS 7.0

You can try different ways to update iOS. One of them shows below.

If a message says that an update is available, you could then click "Install Now" button to start to update your iPhone iOS software. Also, you could manually check whether there is an iPhone iOS update or not on your iPhone. The below steps would show you how to update iPhone software wirelessly:

1. Before you update iPhone software via WiFi connection, you need to make sure your iPhone has enough storage and battery to support the iPhone update.
2. Connect your iPhone to a WiFi network.
3. Tap "Settings > General > Software Update" successively.
4. Tap "Download and Install" option when your iPhone has detects an update available. If a message asks to temporarily remove apps because iOS needs more space for the update, tap Continue or Cancel. Later, iOS will reinstall apps that it removed.
5. Then iPhone would start to download and install iOS update immediately. You only need to wait for the update complete.

For more methods, check: How to Update iPhone

Yes!
Most people are now on iOS 8.4
So.... do you mean back grade? from 8 to 7
iOS 9 will be released in a few days!
https://www.apple.com/ios/

It can be downloaded & installed directly to your iPhone/iPad
Or... as I prefer.....
use my computer running iTunes to firstly Backup the iDevice (using it's USB charge cable)
ITUNES will at this time indicate that there is an update available for your iPad.
Choose to "download only" the new iOS.
If you have other things to do!
Disconnect while the download takes it's time downloading.
Then come back later and plug in USB cable and "Install" the updated iOS.
How to Update iOS Software on an iPad

on a 1.gen. iPad it is impossible to install iOS6:
this model supports only iOS 5 !
- NO iOS 6/7/8
- the processor is too slow....
For the iPad first generation (A1219) before iOS 5 to update is only possible with connecting the device to iTunes on a computer. Plug it into your computer and open up itunes under devices click on your ipad and then click on check for update.
- but this model supports only iOS 5
- NO iOS 6/7/8 !

There are two ways to upgrade the iOS of your iPad
- via connecting the device to iTunes on a computer
- or directly from within the device
so in your case you can try connecting the iPad to a computer with iTunes installed
procedure:

• Connect your iOS device to your computer using an USB cable. Wait for iTunes to open and connect to your device.

• Click on device button to the left of the iTunes Store button in the top right corner in iTunes.

• Hold down on the option key (Mac) or the shift key (Windows) and click the "Check for Update" button in the Summary pane. Browse to the .ipsw file you downloaded and select it.

• Do not disconnect your device until the update has finished.

• If necessary, restore your device from the previous backup and sync with iTunes.

Install iOS 7 0 4 update on iPhone or iPad Tutorial

For the iPad first generation (A1219) to update is only possible with connecting the device to iTunes on a computer.
- this model supports only iOS 5
- no iOS 6/7/8!

iOS is not an app - it is the running system of an iPad and is to be dowloaded from Apple:

- the download depends on the model of your iPad:
For the iPad first generation (A1219) to update is only possible with connecting the device to iTunes on a computer.
- but this model supports only iOS 5
- NO iOS 6/7/8
-------------------
for all other models:
There are two ways to upgrade the iOS version of your iPhone, iPad, or iPod Touch - via connecting the device to iTunes on a computer
- or directly from within the device, but only snce iOS 5, it is possible to upgrade the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update

- depends on the iPad model you have:
For the iPad first generation (A1219) before iOS 5 to update is only possible with connecting the device to iTunes on a computer. Plug it into your computer and open up itunes under devices click on your ipad and then click on check for update.
- but this model supports only iOS 5 !
- NO iOS 6/7/8 !
-----------------------------
for all other models:
There are two ways to update the iOS version of your iPhone, iPad, or iPod Touch - via connecting the device to iTunes on a computer
- or directly from within the device, but only since iOS 5 it is possible to update the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update

You will not be able to install if the app requires a certain version of the operating system. I would also suggest updating your device to the latest version of iOS 7 which is 7.0.3 which would also allow you to install the app.

You can learn more about iOS 7 at http://www.apple.com/ios/

Hope that helps!

probably it helps to update your system to the newest
iOS 8.1.2
- there might be a compability conflict between the app and iOS version....

How to Install iOS 8 1 2 On iPhone iPad and iPod Touch

How to do I update to iOS 5?
depends on the iPad model you have:
For the iPad first generation (A1219) to update is only possible with connecting the device to iTunes on a computer. Plug it into your computer and open up itunes under devices click on your ipad and then click on check for update.
- but this model supports only iOS 5
- NO iOS 6/7/8 !
for all other models:
There are two ways to upgrade the iOS version of your iPhone, iPad, or iPod Touch - via connecting the device to iTunes on a computer
- or directly from within the device, but only since iOS 5, it is possible to upgrade the iOS version without the need to connect the iOS device to a computer (over-the-air update)
just go to: settings - general - software update