Invisible characters, such as spaces, can cause errors in the password or the name. If you are not sure whether the whole field has been erased, you can press the Reset Form button to clear the contents of all the fields in the registration form. We think your problem can be solved by using one of the solutions above. We try every password ourselves before sending them to you, in order to make sure that they work. If you still cannot get the software to work after trying the above, it means either the program file or the preferences file is corrupted.
File corruption can happen during downloads or when the computer crashes.
Delete the Astronomica preferences file in your Preferences folder, inside the System folder. Then restart the application and try your password. If that did not work, it means there is a problem with the program file and you should download the package again. It is highly unlikely that you will reach this point, though. The first name, the last name and the password all have to be exactly the same as those on the password sheet you received.