Click and drag the game file to the area on the left side of the screen that says download, from there you can open the used to be nested game file. A more detailed explanation would be to click downloads, double click/open the LHCS file, click and drag the nested file over to downloads on the left side of the screen and boom, you can open the game without the blackscreen bug. Z is used to interact and X is used to exit scenes and open the menu where you can save, load and look at the map of the floor you are on. Also allows fast travel to any succubus you have visited in the save.