Windows (v12.0.95388):
TeamViewer QuickSupport
http://download.teamviewer.com/download/version_12x/TeamViewerQS.exe


macOS (v12.0.92876):
TeamViewer QuickSupport
http://download.teamviewer.com/download/version_12x/TeamViewerQS.dmg

Linux (v12.0.90041):

TeamViewer deb 32-Bit / 64-Bit Multiarch
http://download.teamviewer.com/download/version_12x/teamviewer_i386.deb

TeamViewer deb 64-Bit without Multiarch
download.teamviewer.com/download/version_12x/teamviewer_amd64.deb

https://www.teamviewer.com/de/download/previous-versions/