Just as the description says: do not upgrade any augments (use Praxis kits), use any weapons or toss any explosives (mines or grenades; explosive barrels, if thrown, do not count
).
This DLC does not take that long, and honestly, is not that difficult. If you do not feel confident breezing through this mission without any handy augments, then play on the easiest difficulty.
Stealth is key here, as well as exploring the areas thoroughly. You won't have the abilities upgraded, such as hacking, so anything above a Level 1 will be off limits UNLESS you can find an alternate route (and they exist). Also, leaving enemies alone OR dealing with them one at a time will make things much, much easier for you since you only have 2 fuel cells, and no upgrades on how quickly the first one regens.
DO NOT PICK UP ANY WEAPONS AT ALL. Seriously, just leave them where they lay. Do not even give yourself the opportunity to make an error and put a gun in your hands. If you want to sell the guns, I say do not worry about it - there are plenty of pain killers, energy bars and hypostims laying around so you literally will not need to buy anything.
If you get stuck in an area, and can not seem to find a route around a secure door or laser grid, then refer to the below articles; there are some keycodes and passwords for SOME, not all, of the doors/terminals:
Keycodes:
http://deusex.wikia.com/wiki/Keycodes_%28DX3%29#Hei_Zhen_ZhuPasswords:
http://deusex.wikia.com/wiki/Passwords_%28DX3%29#The_Missing...Questions, corrections and neg vote justifications below.