1. Head to www.lineal.co.uk
  2. Locate the 'Software' drop down at the top of the page and click on the 'Downloads' option
  3. From here, click on 'TeamViewer Host'
  4. Run the downloaded file
  5. Keep accepting and going forwards with the install when you get to here, choose the one which applies the most to yourself. It's not a make or break option though so don't stress over it.
  6. Tick this box and TeamViewer should now be installed for you. 
  7. You should now have a TeamViewer ID and Password to give to your technician.