Download and install CloudMounter on your computer.
How to add Dropbox to desktop computer
CloudMounter is a handy cross-platform solution aimed to connect cloud computing services and remote servers as local drives thus saving space on your computer.
In order to mount Dropbox to your computer follow these simple steps:
Once installed, launch the app.
Choose the Dropbox icon from the list and click it.
Sign into your Dropbox account.
Click the Mount button.