I think this is where UV Classic and UV Mapper Pro differ. I only have Classic;
I selected only the vertices that seem to be causing the problem, then went to tools and the only options at that point are fix seams, split vertices, weld vertices. I don't see any option to invert them. 

Here's the link to my freebies:   https://www.renderosity.com/mod/freestuff/?uid=493127

My cousin Jack can speak to beans. That's right.... Jack and the beans talk