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Thanks for you answer, it gives me faith that I am doing right.  

Yes that's a good point. So if you are just translating content but not targeting it to specific countries only, you can use href lang to specify the language, without specifying the country. E.g. would specify French Canadian content but would just state that it is for all French speakers. In this case, you wouldn't need different top level domains to target each country, which is probably more than what you need! Hope that helps.

They do say to contact them if you're looking for one of the other systems, Jonny. Might well be worth an email to see if you could try out a beta version of the JS. (if you're into messing with beta stuff) Glad you found it helpful Paul

You could also list 'related posts' or 'you may also be interested in' posts which link to your conversion posts.

Hi Sheldon, question again: I read the Google's official guide of the rel=alternate hreflang=x tag, Google says that if your page's navigation, sidebars are translated, or you want to target on specific region which use similar language, you can use this tag. But for me, I just have 4-5 fully translated pages, not just translate navigation or sidebar, should I use this tag?

Like Alan, I have my doubts about whether the canonical tag is the best bet here. If the download/order page are down the click path from the product info page, I think it's ok to META NOINDEX,FOLLOW those pages (they have little or no search value). I generally wouldn't noindex and canonical a page - it's a mixed signal, and if things go wrong, you won't know why.

Try disallowing the user agent in your robots.txt file and pinning down the IP address of the scraper so you can deny it in your .htaccess file

Thanks dude, that's the answer I need.