It is here:

Use the following license to register the product:

BEGIN LICENSE
UNSUPPORTED_FREEWARE_VERSION
UNSUPPORTED_FREEWARE_VERSION
DC4C5AED5405F6CC5405E5C733943394
247C616841190441039539253EB3B5FF
END LICENSE

Copy it all (include the BEGIN and END LICENSE lines). In the Advanced Options dialog, click on the "About" button, then click on the "Register" button. Paste your registration info and click OK.