I'm not sure what that means - even when the Morphs++ had to go in the application folder (Poser 6 and earlier) characters didn't, so it doesn't really make sense unless there's a custom morph included as well as dial settings for Morphs++. You certainly need to have the Runtime with the Morphs++ as an active library, but it should be safe to place the character in a different Runtime (I'd create a brand new one, place the character in that, and make sure it works: if it doesn't you can then simply delete everything in the new Runtime and try installing to the same folder as Morphs++; if it does you can merge the new Runtime with the one you want the character in).