Step1:

Sign up a new Free account on the http://hotfile.com site that you want to use premium cookie.

Step2:

Install "Cookie Editor" addon https://addons.mozilla.org/en-US/firefox/addon/13793/ then restart your Firefox browser.

Step3:

Sign in with your signed account or any free account.

Step4:

From the Firefox menu, click to Tools then select Cookie Editor.

Step5:

Double click the "Hotfile.com" with "auth" value or highlight the auth then click edit.

Step6:

6: Paste the value of premium cookie to "Content" and click to Save button then refresh the browser.

Step7:

Copy/Paste the link to the browser that you want to download.

Hope this tutorial will help you...