The Agreement plugin helps to create pop-up licence agreement or term to use before download any thing from post or page.
Is it works for custom content type?
Yes it works.
From where I can change text of pop-up ?
After activation,there is a sub menu in Settings called Agreement. Click on this. New page will open,there is an option to change license agreement text called "Enter your License Agreement setting text below:".
For more details http://www.indiatale.com/agreement/