Hello,
regarding the unlock problem: it is normal that you cannot unlock version 3 with the unlock code for version 2 as this are two different programs. That is why you receive a new unlock code when ordering the upgrade.
If you are sure that you have the normal version from our website, you can download the most current version from the site.
The update manager just checks for new updates available and downloads the same install script as you can find on
http://www.password-depot.com/downloading.htm. The advantage of the update manager is that it downloads the right edition, for example if you would have a special edition. After downloading the update can be installed as usual.
Best regards