Show tempdir paths if anything errors

[9999years]

This is pretty embarrassing honestly! This is going to get someone's ass and then they're going to come into this repo and yell at me! And rightfully so! I should fix this before that happens.

[9999years]

So I don't think the convert command deletes tempdirs ever. But it also doesn't leave anything in them if it works correctly and it doesn't print out where they are by default, so there's room for improvement here...