Teamviewer is by far the best tool for remote support. To support our clients we have a registered license. This means that clients can install and run TeamViewer without having to buy a license.
TeamViewer has just updated to version 11 (Decmeber 2015), which we will not be upgrading to. The software has been perfect for our purposes since version 9, and to us it looks like the updates since v9 are adding features which do not provide us with any measurable value for money at this time.
For now, we’ll stick with Version 10. This is available for download from the teamviewer site and are perfect for our support purposes.
Download TeamViewer v10 (www.teamviewer.com)