Sorry, I’m away from my development computer until July so I can’t dig into this right now. But here are some quick thoughts:
o Most of the data is WP custom post types which can be exported/imported using the built in WP tools. You may have to export the DB as well.
o The MSTW CSV Exporter worked once upon a time, but I’m pretty sure it is out of sync with League Manager. Mileage may vary.
o You can import the data using the plug-ins CSV Import function. You may have to re-enter all the data into Excel, but that is sometimes much faster than entering it into the plug in.
If you have no luck, ping me again after 4 July and I will dig in a bit more with the code (the only guaranteed accurate documentation LOL) in front of me.
-Mark