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You want to know why Leisure Suit Larry 4 never was released?
To write something down you need some paper but the printer is empty. Use the computer and click on the printer-icon to print a sheet of paper. Click on the lower left to close windows again and take the PAPER from the printer.
Now you need some inspiration. Use the door to go outside. Look at the billboard. There’s inspiration enough. Now only a way to record this. Look in the trashcan to take a PENCIL out. Use the door again to enter the house.
So that’s why there was no LSL4….
Game source: A copy of the game was found here  on the internet.