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Everything should happen automatically. Try walking around the cell a bit if you haven't already.
Try replacing earth.mis.What should happen is that approximately five seconds after the message appears, you will get another loading screen, and then appear to be back in the cell again. But if you walk around a bit the second time also, then things will progress.I've attached my copy of earth.mis which is confirmed to work. Download it and replace yours with it; we'll see if that fixes the problem.
I don't know if this is causing your problem, but when playing FMs, you should always uninstall one before installing another. So yes, you should have deleted all of Ponterbee Station's files before unzipping Nightwalker into your folder.This is one of the reasons the SS2 Mod Manager exists; all you do is click one button to install a mod or FM, and another button to uninstall it.So for you: delete all files that came with Ponterbee Station and Nightwalker. Then unzip Nightwalker into your SS2 directory. If you still have the problem, uninstall SS2 completely, reinstall, then go download the mod manager and use that.