Question: if I've got a mod that isn't mine, that I wish to release on tes nexus, because it is disappeared from the whole world (the whole world means planet elder scrolls, given the fact that it was uploaded only there), would I be banned if I give due credits and add the words that I would remove it if the author wishes so?

The author is nowhere to be found and there is no 'permission' section inside the readme. I find a shame that the mod isn't played by other people.