Problem with prefiles.com plugin ''method_free' in the title was not found'

I cannot download files from prefiles.com because plugin shows ERROR - Tag Form containing 'method_free' in the title was not found
I have look source code of the page downloaded by FRD and actually there isn't 'method_free' string. But If I look source code from a real bowser I can see the form with 'method_free'. I have attached a file (frd_vs_firefox.html) where you can see the differences between source code obtained by FRD and by Firefox.

* FRD version: 0.9u4
* Prefiles plugin version: 2.08,
* Download link example: [prefiles.com]
* app.log attached

Regards.

problem details reported

the plugin moved past the first page, which contained method_free
but got stuck on the second page where it has the message
This file is available for Premium Users only

plugin updated to detect this message

Ok. Thanks.

Verified with new plugin version.