@Idylla : a couple of things you can do about that for the future.
Keep a list of the download links as soon as you paid for them, you can go back to download whenever you want (as long as they stay up). Keep that list safe of course, because it's evidence that you've downloaded stuff you should not have 😉
Mega downloads have a feature where you can copy them to your own account. So create a Mega account, and copy stuff you want to keep. It also means you can repost if the link goes dead.