мне в такой же ситуации техподдержка ответила следующее:
Luckily we have a tool that should help you out. We call it the Key Resender tool. It allows you to input your email address and we will send you download links for all of the bundles you have claimed or purchased on that address. You can find the tool at the following address: http://www.humblebundle.com/?s=resender
Let me know if you have any trouble using that tool. Otherwise, happy gaming!
Мне помогло