从来不is uesed in the present and future , but 从来没+v+过 means somebody has never done sth until now. 我从来不喜欢吃苹果。i never like eating apples. 我从来不想出国。 i never want to go abroad. 我从来没去过上海。I have never been to Shanghai. 我从来没看过这个电影。I have never seen this movie.

从来不：something you're not willing to do and would neverdo. 从来没：just something you haven't done yet.