While there is a field to enter your email address when downloading, just uncheck both the checkboxes for the Apple newsletters and you can download without giving an email address.
For the installation itself, as best as I can tell, it's basically the same as if you downloaded it from Apple's software update tool.
The complaints are coming mostly from users running the Windows platform on their computers.
The main pattern is an error prompt, that abruptly stops the update process, claiming “Rent once, watch anywhere.
One option for ensuring that your version of i Tunes is up to date is to manually check for updates.
If you've upgraded i Tunes and don't like it, you may want to go back to the previous one.
It's also a good idea to re-run i Tunes to make sure everything is working.
If you're having problems using the above method, or i Tunes doesn't run at all, then you can also upgrade i Tunes by downloading an up-to-date installation package.
To manually check for i Tunes updates, ensure your i Pod, i Phone, or i Pad is connected and run the program now.
As with the PC version, you may have to restart the computer after i Tunes updates itself.