I have, yes, multiple times. I still hasn't worked for me. :/
This may not make a difference for you -- but it has with me before. Before you move the textures/items into the their folders, move the .cfg files FIRST.
If it asks you to replace the file then do so. Then you can move the others FH>Media>Textures/Items.
May I ask if your using a mac? The whole "black screen" thing has happened to me before on my mac and it only takes a few minutes to light up again. If you are, don't restart right away, give it a bit of time before pressing anything. If need be, maybe shake your mouse or press a few buttons but don't switch your power off.
I have a feeling something went wrong when you copied your files into your regular downloads folder.
You mentioned that at first you used your old markings and item files, so the next time you re-download FH I think you should download new item and marking files because I have a feeling something is messed up in those files.