@shaitan: I was just having this problem also and I think Roku changed the way you add beta channels and that's why you're getting that error. Now you have to go to your "My Account" page and at the bottom you'll see an option to add a channel with a code. Click that and enter the last part of the URL you were trying before: 2CJNDZ. Once I did that, I could download the updated channel.
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