I think the new update has an issue, making it impossible to reach the Dark Alley. You can unlock the dark alley when you first meet skruvaks and go for the sex action (variables 1 or 2). If you dont, it will remain locked (variable 0). To get to the Dark Alley now, in order to access the 2nd floor, the variable has to be >0..which is impossible if you skipped the skruvaks sex part.