How do I download iOS 4.3 to my computer to synch to my iPod?

You cannot.

If you have a second gen ipod touch, then it can only go to 4.2.1

If you have a 3rd gen, then it can only go to 5.1.1

If you have a 4th or 5th gen then it can only go to 6.0.1

You update as always. open itunes, connect ipod

Please do not start multiple threads on the same topic.

HT4539 How do I download iOS 4.3 to my computer to synch to my iPod?