If room is very tight then you can get away with installing only the main Poser file. A downside is the User Manual PDF is in the support files. You cannot add them in isolation you must re-install Poser at the same time. I've not found a download for the P11 manual PDF- can this be made available here (serial number required)?

Poser 11 , 180Gb in 8 Runtimes, PaintShop Pro 9
Windows 7 64 bit, Avast AV, Comodo Firewall
Intel Q9550 Quad Core cpu,  16Gb RAM, 250Gb + 250Gb +160Gb HD, GeForce GTX 1060