Completed the Nightmare:

All secrets (classic levels, doom dolls, drones, runes, PDA, elite security) 100%

Tests at each level 100%

Upgrading Suit 100% Weapons 100% Runes 100%

Unpack the contents of the archive into the folder: C:Users*username*Saved Gamesid Software

I'm trying to play through the game on Ultra Nightmare so I can post it later!