Musíte nainstalovat jako první "MP520 series MP Driver Ver. 1.01 (Windows 8.1 x64/8 x64/7 x64/Vista64)"!
Potom to ostatní.
http://www.canon-europe.com/Support/Consumer_Produ cts/products/Fax__Multifunctionals/InkJet/PIXMA_MP _series/PIXMA_MP520.aspx