Can't install with my humblebundle Key

I bought the software in humble bundle years ago and have been using it since, I recently built a new PC and for some reason it won't activate using my key and email address, how can I register?

Make sure you're using the actual key file, from the most recent email you would have received from us, and not the initial Humble code which was used to unlock the key.

If you still have problems, please email with details and they should be able to help.