Hi!
You can run eduke32 by copying your Duke3D.GRP file (Which you can obtain via GOG or Steam)
GOG instructions below for Windows:
1. Install Game,
2. Navigate to directory where the game installed (Assuming C:\GOG Games\Duke Nukem 3D) and find the GRP File int here
3. Copy to the PandoraSDCard\pandora\appdata\eduke32.
GOG Instructions for Mac OS:
1. Secondary Click or Option Click on the game.app inside the dmg provided and click "Show Package Contents"
2. Navigate to Contents / Resources and you should see the DUKE3D.GRP file there (if not do a spotlight search on it)
3. Copy to PandoraSDCard\pandora\appdata\eduke32
IIRC eDuke32 asks you where the GRP file is located before the game will work, so you should point it to that folder via the navigator.
GLHF!