Testvb to live/forum advice

[Gimmick]

I have my live forum running 3.6.8 patch 2. But I am experiencing problems with an addon when installing there. So I created a testvb forum and have been working on that instead of disrupting a live site.

My problem is I now have my testvb running the way I want it, and want to import my users and posts into it as a final test sort of thing, to make sure an error doesnt occur. (the test forum is totally password protected and not live to anyone bar me)

If the user integration is successful I would really love then too somehow copy my testvb forum to my live forum to replace it?

I guess most of that sounds a bit n00b but its the best I can explain.

Basically I think I have messed some code on the live forum so when I add a certain supported addon it kills the forum. But now I have sorted that in the testvb Id feel better using that as my live that trying to upgrade the live and readd the addon for the code I broke to come back and haunt me ...

What would be the best way too do this? Is it legal? Can it be done!?

Thanks for your patience reading!

Gim