Sure, I recommend you install Git to download all the relevant Rubber Ducky code. Once you've installed Git, simply run the following command to clone everything:
git clone https://github.com/hak5darren/USB-Rubber-Ducky.git
From there, follow the instructions posted @ https://github.com/hak5darren/USB-Rubber-Ducky/wiki/Flashing-ducky
The Twin Duck firmware is located in USB-Rubber-Ducky/Firmware/Images/ -- there are several versions but try c_duck_v2.1.hex
Yes, the last script also cleans up the evidence. If you use the script, make sure you download Invoke-Mimikatz.ps1 and copy/rename it on your Twin Duck as im.ps1, you'll also need to modify the drive volume label to read DUCK