D Mo i also bought HB Tier 4 and have similar problems I already had Sample Tank MAX and Syntronik Deluxe and now many of the extra v2 libraries
fail to start download in the Product manager The main reason to buy the bundle was Sampletron 2 witch is among the v2 libraries i cant download .
i opened a support ticket to IK and waiting for a response In my IK user area its exactly the same situation with you , no option to download v2 libraries
I hope its a mistake of IK servers and not something done in purpose due to the low price . The product description in Humble stated that the bundle included
the full ST 4 max v2 and their link to IK site was exactly the same product . Anyway i will wait a few days and if the problem still exists i will ask Humble for a refund