Upgrade to Internet Security version

At the time I upgraded one of my three home computers to the Internet Security version I was informed that a separate license fee would be needed for each processor. I see that you now offer the same group/family rate for the upgrade that you do for the Pro version. May I now upgrade and activate my other two home computers using the activation file that I purchased for this one at no extra expense?

Please contact Avast: http://www.avast.com/contact-form.php?loadStyles - use the drop down menu for Sales Inquiries. Thank you.