Install or Upgrade Parallels Desktop Follow the instructions in this chapter to install or upgrade Parallels Desktop. Note: You can either purchase a boxed version of Parallels Desktop or purchase and download it from the Parallels website. In This SectionWhat You NeedInstall Parallels DesktopActivate and Register Parallels DesktopPurchase Parallels DesktopUpgrade Parallels DesktopSet the Language