Wow that is really a small number of posts and members.
If I were you just install ubb 7.7.5 and then tell the couple of users to go to the new forum.
You can do this a couple ways.
Make a announcement on both forums.
Set a redirect on the old forum to goto the new forum.
Many ways to do this.
Than to fool with the importers.
With the limited number of users and content I do not see the value in a import in your case.
With the limited number of users you could even create each user manually and send them a password via email from the ubb control panel.
You could install ubb at
https://www.stellpower.com/forums/ so it is very similar
