I downloaded the 15.2 last night, and it seemed to work fine from the US site.
I followed the link that did not work, and erased everything but:
http://pocketbook-global.com/
Then I chose my country:
http://www.pocketbook-usa.com/
Then I chose support:
http://www.pocketbook-usa.com/support/
Then I chose Pocketbook 301:
http://www.pocketbook-usa.com/support/pocketbook-301/
There you will find working downloads =)...
Hope that helps!
EDIT: Added my process for working download