Parallels - Installing Parallels 10 Desktop
-
Double-click the Parallels Desktop 10 installation file with the .dmg extension that you received. Once you do this, it will be mounted to Finder.
-
Then double-click the Install icon.

-
Enter your Mac user password to begin installation.
-
If you are upgrading to Parallels Desktop 10 from a previous version, you will be prompted to replace the old version. Click Replace to remove your current version of Parallels Desktop and install Parallels Desktop 10.

-
When the installation is complete, you can create a new virtual machine and begin installing Windows 8. For instructions, see the following article: Parallels - Installing Windows 8 on Parallels Desktop 10.
You can also see Parallel's document on this process: .How to Install or Upgrade to the Latest version of Parallels Desktop for Mac.