To give the best support we use Teamviewer to work with you directly. If requested by a member of our support team please use following Teamviewer QuickSupport file based on Teamviewer version 12. There is no need to install this tool. This is double-click and run only.
You can use it beside your Teamviewer 13 installation.
If you want to check the consistency of teamviewer12_qs.exe
here are the checksums: