Upgrade Parallels Desktop
If you already have an older version of Parallels Desktop, follow these steps to upgrade to Parallels Desktop 18.
- 
          If you haven't already done so, purchase and download a "Parallels Desktop 18 for Mac Upgrade," available from the Parallels Online Store at
          
           https://www.parallels.com
          
          .
          
A Product Activation Key is sent to the email address you provide.
 - If Parallels Desktop is open, quit Parallels Desktop.
 - 
          Follow the instructions to install Parallels Desktop 18. See
          
           Install Parallels Desktop
          
          .
          
During installation, the previous version of Parallels Desktop is automatically removed from your computer.
 - 
          Open Parallels Desktop and enter your upgrade Product Activation Key.
          
If you were using a trial version of Parallels Desktop or you purchased a previous version but haven't installed it on your computer, you will also be prompted to enter a full or upgrade key for that version.
 
Troubleshooting
If you have any problems upgrading Parallels Desktop, you can find troubleshooting information at https://www.parallels.com/products/desktop/support/ .