Next, log into your Avid account and click on “Activate & Download Your Product” under “Products.”
After you click that link, you will be taken to another web page where you will enter the activation code you received when you purchased Sibelius. Click “Download Now.”
Next, enter your Sibelius serial number and click “Continue.” You will now see your Sibelius System ID, Activation ID, and downloads. Please note that if you bought a boxed version of the upgrade, you won’t need to download anything.
When you open Sibelius 7, you’ll see a window asking you to active. Click “Activate” to continue. The license control window will now open. Again, click “Activate.” On the next window, you’ll want to select “I want to upgrade my product using the Internet connection on this computer” and click “Continue.”
On the next window, enter your System ID and your Activation ID then click “Activate.”
If you’re still having trouble, here’s a video demonstrating the process described above.