Would they be able to run it on Inqusuit 3 if the original script isn't?
In rare circumstances some characters might be garbled because Inquisit 4 is a Unicode application whereas Inquisit 3 is not. Apart from that, there should not be any major problems. However, I suggest you try it for yourself first.
Sorry, that might seem like a dumb question......
It most definitely isn't...
Regards,
~Dave