If you encounter any issues during the installation process, here are some troubleshooting steps you can try:
After you have signed in to your Dropbox account, follow these steps to set up your Dropbox folder: how to install dropbox on my computer
Go to www.dropbox.com/install
"Make files online-only" to save local hard drive space. If you encounter any issues during the installation
Once you have installed Dropbox, follow these steps to sign in to your Dropbox account: how to install dropbox on my computer