1. Go https://www.teamviewer.com 
2. Click the Download button
3. Follow the instructions to save the setup file
4. Run the setup file you have downloaded previously
5. Select Installation to access this computer remotely (unattended) 1 under How do you want to proceed?
6. Under How do you want to use TeamViewer? select the option that suits you.
   • If you want to use TeamViewer commercially (for your Business), select Company / Commercial use 2
   • If you want to use TeamViewer with friends and family, select Personal / Non-commercial use 3
7. Click Accept – finish 4 to start the installation.

source: TeamViewer Community