Before you begin, ensure you've downloaded (and know the location of) the application's .exe or .msi installer file.
Launch CrossOver and from the Install screen, click Install an Unlisted Application.
Click Edit to open the installer file dialog.
Locate the installer file for the program you are installing. Once you have selected the file, click Open.
Click Edit to open the Bottle dialog.
Enter a name for your bottle.
Select a bottle type from the list of bottles and click Done to proceed.
Click Install.
CrossOver creates a bottle for the Windows application's files and then runs the program's installer. Follow the installation steps just like you would on Windows. Typically, leaving the install options at their defaults is fine.
Once the installation is complete, Crossover displays the contents of the new bottle. Double-click the application's icon to run your program.
If everything worked out, you will see a menu entry for your Windows application and a button for the application in CrossOver.
Ubuntu's Unity desktop has no Windows Applications folder. Instead, you'll need to search for the launcher of your installed application by name.
If the Windows application you want to install has a database entry and installer script (CrossTie), see installing a listed applications.
Installing an unknown application in an older version
