If you want to extract SWF elements with this Flash Decompiler Mac, please follow the steps below:
Step 1: Launch Flash Decompielr Mac, open the SWF file in the left explorer panel of the program.
Step 2: Go to "Resources Tree" panel and check the elements' folders you want.
Step 3: Click "Export Resource" button to export the elements of the SWF.
Step 4: Select the saving path and the export format you need, and then click "OK" button next.
Step 5: Refer to the resources of the SWF in the save path you've selected.