If you purchased online then you will wish to install either an online extension license or a full purchased license.
In both cases you will have been given a License Registry file (a file with the extension .reg). If you open this file (e.g. by double-clicking it) your license will be automatically installed on to your machine and you will not have to type it in manually.
If you have been sent the file as an email attachment and can not open it, click here.
If you have the License Installation Screen open when you do this, you will need to click the Refresh button and then Submit the license.
See also: Overview, Trouble-shooting, Purchasing Options, Purchasing Methods, License Installation