I used a different file image and reinstalled the game files. Also reinstalled the launcher, received a ACCESS VIOLATION error. Followed the common errors thread and resolved the issue:
1. Added DEP exceptions for SOURCE files.
2. Selected files Diablo.exe, GAME.exe and the launcher to be run as admin by default.
3. Ran the launcher and succeeded.
Thank you for your continued assistance.
EDIT:
/players 8 doesn't seem to be working?