>>8726812
Currently, the only way to watch the remastered version of Episode 3 is to obtain either the Complete Edition or the Final Edition, but both are confirmed to be out of print.
Furthermore, no streaming services have been confirmed to offer it.
Your options are either to search the used market (where you might encounter unreasonable prices?) or to miraculously find a new-old-stock copy still available locally (though the odds might be lower than winning the lottery)