Problems downloading with premium account

Why cannot I not download from either the EU or NA servers? I have a premium account. But everytime I try to use the download, it says invalid username or password. The settings have not been messed with. I even tried changing my account password and using the new password. Still no go. Thanks.

It's a bug in the software that's being researched by the author, he should have a fix soon. In the mean time you can use the EU mirror from inside the program as that strangely enough works fine.