Well...
I have really good news for you here :)

It is available already for 5.7 and quite a long time.
https://www.concrete5.org/marketplace/addons/quizmaker-pro1...

Did you have any difficulties searching for it on 5.7 marketplace or is it just coincidence please?

Hi there. Is this add-on no longer available? I was interested in checking it out, but it seems to have disappeared.

Hello Campabell,

Yep. we had it for a long time. But with the latest CMS update it stopped working and we decided not to support it further. It required quite a lot of time to investigate what was wrong and it doesn't pay off.. We can send you a version in private message without any charge. But there will be no support. :(

If you make it work for latest concrete5 with some third party developer, we will be glad to receive the update for sake of other customers.

If you were able to send a version, I'd love to at least test it and see if I can get it operational. I really appreciate it.

Any luck with this? I would love to get a hold of a functioning version.

No, we don't plan future product support anymore. Sorry.