Why did my print fall off its raft?
Your trouble lies within the presliced G-code: the temperatures are rather low for PLA and upping both by 10 degrees would be advisable:


200 °C for the Hotend
60 °C for the Bed


Atop that, printing a raft for PLA is usually not advisable.

Get yourself a slicer (the most common free ones I am comfortable with using are Cura, Slic3r and Slic3r Prusa Edition) and either import a fitting profile and create your own profile, then slice the .stl-model yoruself.