Havent logged in to HB for a while, and I've just waisted the last 15 mins jumping through hoops trying to buy the bundle. Try to pay anonymously with card - error at the end, captcha doesn't match (no captcha was shown to me) - try to log in, password doesn't match - captcha - recovery password does not work - remember password, try to login again - captcha - need to verify browser, enter code sent by mail - no mail received, resend mail - enter code -finally logged in and redirected to library (WTF!?) - go back to bundle page and try to purchase again - captcha - need to verify browser again!? At this point I gave up.
I don't remember having to go through all this hassle in the past.
Try disabling your Adblock for that one page. Sometimes the captcha get blocked by it.