Found it, although it wasn’t easy. The migration plugin download link was difficult to find and then I also needed this help Revert to Wordpress.
I’m not entirely sure what I should be checking, but everything looks as it should. There is one NextGen gallery update, but I was expecting another for NextGen Pro. I’ll spend the afternoon testing it out, but I was most impressed with your plugin. It was all done in less than 30 seconds 