Why can't I download apps from Nascent-project.org?

A lot of the apps with beta versions are from there and whenever i click on he link or tight-click and Save as... I get a pop-up for an id and pass which I can't leave blank and hit ok, or cancel, which gives me an error page. I have FF 3.0.1 these are the apps i wanted:
https://portableapps.com/node/11277
https://portableapps.com/node/11129
https://portableapps.com/node/12127
https://portableapps.com/node/12173
thanks