Thank you for the link sir! I've checked the thread and It appears that I've already tried the solutions stated on the thread..

Well, subscribing (and paying) is the way to become a member so that you can log in and finally download there. Frankly, I also like freebies. But if a client wants something that is not accessible as a freebie, there are two solutions: you purchase the pay item and charge the client with the extra cost if you can (especially if he is so picky then he should pay for it) you purchase the pay item hoping that you can use it in the future, in other projects, too and consider it as an "investment" If you often work for clients with such extra wishes, it may be worth subscribing to FF. They have nice, high quality stuff there so it could make a nice turnover after a while as your work would be more quality, too.

make sure you don't have photon map selected as a primary rendering engine. it can render unexpectedly dark (black) results in your primary render, when it shows up fine in the secondary. if that is not the thing causing the problem... make a ticket at support at asgvis dot com.