Proper Gutter and Downspout sizing

I found this and thought it would be useful.

Well the original link isn’t working right. If you go to the following link, you can download the file, it is at the bottom of the page.
http://www.gutterguards.com/s.nl?sc=5&search=sizing%20gutter

It is 1.7MB.

Please fix your link. It opens a login page.