simplify the automatically offered extension pack upgrade procedure

[Aoshi]

After upgrading an existing VirtualBox installation with extension pack installed and starting VirtualBox, a dialog is presented that an older extension pack was found and if the user wants to upgrade the extension pack.

This is fine, however the procedure to upgrade the extension pack is rather complicated and goes as follows:

• Older ExtPack was found, want to download and install new version? Click download
• This is the file to download, still want to download? Click download
• File was downloaded, upgrade? Click upgrade
• Hey, here are the T&C for the ExtPack, agree? Click agree (after reading it carefully obviously ;)
• Installation occures
• Installation successfull, do you want to delete the downloaded file? Click delete

Well, it's not that complicated but just rather annoying because it is every time the same thing and the user already made clear that he wanted to upgrade the ExtPack with the first click.

I would like to propose a simplification for this upgrade procedure:

• After starting VirtualBox, the initial dialog is presented to give the user the chance to decide if he wants to upgrade or not
• If the user decided to upgrade, a single dialog is presented.
  • It could contain either the link to the ExtPack that will be installed or a version comparison (current version vX.X.X, new version vX.X.Y)
  • It could contain a checkbox, which is checked by default, to delete the file after the upgrade
  • It could contain a linked message like "By installing the extension pack, you agree to the T&C" where the link poins to the said T&C
  • It has two buttons: "Download & Install" and "Cancel"
  • Optionally display an OK dialog that installation was finished

This would drastically increase user friendliness and simplify the ExtPack upgrade procedure. Keeping the initial yes/no dialog choice to upgrade also helps the average joe to panic by being slapped in the face with a full blown dialog