Hi Al, perhaps this can be solved only by Juan, but for checking:
In this site:
http://dist.pixinsight.com/ you have to include the data you have recieved in the original email for download and activation of the software.
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Usuario (username) : wa4hnd
Contraseña (password) : xxxxxxxxxxxxx
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I just try again and it works fine with my user name and password
Hope your problem can be solved soon .
Alejandro.