Causes game crash CTD from main menu>Arena>Select Ship>New Profile. When you scroll the ship selections from there and get to these ships it Crashed to Desktop.

Mod throws errors on bottom left of game screen, in 0.9.0.06:
"Flotilla file:
[Mod path/folder]\invo.flt encountered an error and was disabled"
"Flotilla file:
[Mod path/folder]\Invo Mus x2 Sinu x2.flt encountered an error and was disabled"

I can't recall I'm afraid, this mod was also made quite some time ago, so if the spawn routines have changed I don't know where they might pop up now.

Where do these spawn? I've seen exactly one of these ships so far, and it was in the home sector, but it was seemingly at random.