Use the recording function to save the animation. The software will create a .led file, which is the standard format for the SD card.
Because this is legacy software, it runs on almost anything today, but it has specific quirks: lededit 2014 v2.44
(or manual layout if your design is highly irregular). Enter the dimensions of your LED grid: Width: Number of pixels horizontally. Height: Number of pixels vertically. Use the recording function to save the animation