Unfortunately no such integration exists with any version newer than v1.3 (which is no longer supported). It's something that we intend to reinstate in the future, but currently this is not possible.
I am glad it is under consideration. Downloads are a great feature for a forum, but some people (not all) have to download every file, and that uses up bandwidth. It would be better if they had to buy some credits to be able to download through VBCredits- then at least the bandwidth they use would be reimbursed.