With Poser 5 you have to have the SR4 or else it won't work.  SR4 removes the protection from Poser 5.  If you have Poser 5 installed anywhere else on another machine it is really simple to go to that machine and copy the whole Poser folder onto a thumb drive and then move it to anywhere else.  I have both Poser 5 and 6 on a thumb drive and can just plug it in and run the program form the folder with no problems.  

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13