Q: How do you download on your Ipod touch.

Here's how to update your iOS device.   When you update your iOS device locally, you'll be using the Settings tool, and you'll automatically get the most recent version available for the particular device.   FWIW, there's also also no iOS downgrade available.

To update

The Settings>General>Software Update comes with iOS 5 and later.

Connect the iPod to your computer and update via iTunes as far as your iPod model allows

iOS: How to update your iPhone, iPad, or iPod touch

A 1G iPod can go to iOS 2.2 via iTunes and iOS 3.1.3 via

Purchasing iOS 3.1 Software Update for iPod touch (1st generation)       

https://buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/touchLegacyLandingPage

- A 2G to 4.2.1. Requires iTunes version 1o or higher. If a Mac it requires OSX 10.5.8 or later.

- A 3G to 5.1.1  Requires iTunes version 10.5 or later

- A 4G to 6.1.5  Requires iTunes version 10.7 or later. For a Mac, that requires a Mac with OSX 10.6.8 or later

Identifying iPod models

Note only the 4G iPod can go to iOS 6. The 5G initiall came with iOS 6 and is the only one that can go to iOS 7

Here's how to update to iOS 6:

1. You need to have at least 3 GB of avalible disk space.

2. Make sure you are connected to a WiFi network. If not:

  1. Go to Settings.

  2. Tap WiFi.

  3. Click on a WiFi network.

  4. If the network is secure, enter the password to the WiFi network.

3. Go to Settings.

4. Tap General.

5. Tap Software Update.

6. Click on download and install.

7. When the download is finished, you will get a message. Tap install.

8. iOS 6 will install.

9. After the installation is finished, follow the setup assistant.

Hold the home and sleep/wake buttons at the same time until the Apple logo appears.

Assuming iTunes completed the backup and if the iOS device isn't being seen or accessed by iTunes, then:

• try disconnecting and reconnecting the iOS device from your laptop
• failing that, then restarting iTunes and connecting the iOS device again.

If that doesn't resolve this, then run a factory reset and restore.   I've had a few cases where iTunes has gotten simply gotten confused, and cases where iOS got confused, and — if the steps above don't work — restarting iOS and running a factory reset and restore as described in that tech note has resolved this.