I've laid a few hundred boxes of Allour and never used any adhesive, It's a floating floor system.
I would first lay down 15 LB roofing felt over any bare slab taping the seams with packing tape. Then use a layer of 1/4 sanded plywood that gets Tap Coned to the floor using 5/16 flat head screws. (Tap Cons are special screws for concrete)
The Allour has a strip of adhesive under a strip of paper that gets peeled off and each piece is strick to the next one, not directly to the floor. That type flooring expands and contracts some so a gap must be left between the walls and the flooring or it will buckle.
Allure Flooring Instructions | eHow.com