I think I may have figured it out. On a Mac, you can use "sudo" to be a superuser and give you access to important administrative functions. But on windows this doesn't work. I found that if I opened the "command prompt" app in administrative mode, then the function below worked and I was able to install the font jars just fine. So the repository is working fine, I just did not understand the security structure of the Flash Builder sdks folder. It requires administrative permissions.
ant thirdparty-downloads -- Sent from: http://apache-flex-users.2333346.n4.nabble.com/
