Download StackDock, decompress it, and put it in the Docklets folder of RocketDock (Windows (C :) → Program Files (x86) → RocketDock)

Right-click the place you want to make and click "stack Docklet" from "Add Item".

Click "Icon Settings".

Click the blue part on the right side of “Folder”.

Here, select Downloads and click OK.

Click the blue area at the right end of “Icon”.

Open RocketDock's Icons folder, select Download Folder, and click OK.

Select “Grid” from “Mode” and click OK.

This is completed.

This is what happens if you select "Grid".

This is what happens when you select "Fan".

After rebooting, the icon may look like the image and you may have to reconfigure it.

Open "Dock settings ..." and select "General"

Check "Store settings in INI file" and click OK.

This is an image of Docklets of RocketDock (Windows (C:) → \ Program Files (x86) → RocketDock) opened.

Check that the Setting.ini file is created.

Even if Setting.ini has been created, it may be necessary to reset it again, so please backup it.

Also, Setting.ini may be rewritten.