I try to download video and it logs me out!

I have a problem with downloading two videocourses, which I bought yesterday. I've payed money and got an email with a link to videos. I clicked this link and saw 'you can by the product for ...' text there. When I try to download free pieces of video, it sings me out. Can I get this videos another way or how can I deal with it? Thank you.
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