Please provide details on the broken link that you are seeing with the Flex 4 training here: http://www.adobe.com/devnet/flex/videotraining/. I'm not seeing the broken links, and we want make sure that you can get to what you need.
On the new Flex 4 version there is a link to the archived Flex 3 training, which we have continued to publish for folks who are continuing to use Flex Builder 3. You can find that here:
Please let me know if this solves your issue, as we want to make sure you can progress with your training!
Thanks for ur quick reply, now i am able to continue with my Flex 3