If it still doesn't work after that I will be most confused. Either that or I'm worse at instructions that I thought
It's not you, it's the install. I had a working install with the 6/15 download, but the 6/21 download breaks it. Didn't test extensively, but it does crash when you attempt to enter the inventory screen when equipping the Skyranger. 6/15 version worked perfectly and reinstalling that gets everything working again.
[Clarification: when I say "working perfectly" I mean in the regular campaign itself. The 6/15 version still has the bug where it crashes upon exiting the single battle mode, which is a separate issue from this latest problem.]