When an update becomes available, iTunes gives you the options of download only or download and install. I tried the first, planning to install later but then couldn't find out how you install an already downloaded update. So I ended up re-downloading with an fresh "download and install". So what did I miss?

To browse for a firmware within iTunes click the update button while holding down the shift key (windows) or the option key if you are on a Mac.

Goggle "browse for firmware iTunes" if you need more help.

Cheers.

Originally Posted by TonyR

When an update becomes available, iTunes gives you the options of download only or download and install. I tried the first, planning to install later but then couldn't find out how you install an already downloaded update. So I ended up re-downloading with an fresh "download and install". So what did I miss?

After you have downloaded an update but not installed it each time you Sync with iTunes it will think a while and then display a dialog saying you have downloaded an upgrade but haven't installed it yet; do you want to install it now or later
If another upgrade comes out before you have installed a prior downloaded one the dialog will go back to saying there is a new OS available and asking if you just want do download it or do you want do download and install