How to put the text from the forum microstock.ru 1 to 50 page by using Content Downloader?

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Want to learn how to parse the posts from separate branches of the forum for example that branch.
www.microstock.ru/forum/showthread.php?t=54
I want to know how to get the whole document contains all post_messages of this branch from 1 to 50 page.
Or 1 at page 611.
I get to put only 1 post = 1 post_messages.
Tell me what am I doing wrong?
Received text document I open with a text-to-speech.
1 shot
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June 14th 19 at 20:45

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