Exactly, usually there won't be any 'free space' and the 'elive-installer' offers a nice tutorial on how to create the needed free space:
After which the installer on a subsequent restart can make use of the available free space....and that's where the 'hand holding' can be done, in the same fashion that the Ubuntu 'calamares' installer does.
Uhuh, with the addition 'for noobs coming from Windows', so your setup isn't in any way representative. Go back down memory lane and remember your first encounter with 'unix' to empathize.
Keeping in mind that resizing a Windows partition is best done from Windows itself and subsequently the elive-installer then leaves a new adopter in the dark on how to best proceed. 
That's where an extra effort is needed else the newbie risks losing the partitions that were just resized after all.
