2224870 - %SAPsrcDir%\sapgui\CalSync\CalSync.msi is not installed 0x80070645

• You are installing SAP GUI for Windows version 7.40.
• The SAPSetup error (or SAP GUI installation checks) displays the following error :  %SAPsrcDir%\sapgui\CalSync\CalSync.msi is not installed 0x80070645   Workstation Check Msi  Component $CalSync is in error. It has not been successfully installed. 0x80004005
• The SAPSetup.log file shows the following :
  NwSapFeiUt  1   MsiAction: installation of product CalSync 2.0 with commandline 'REBOOT=ReallySuppress ALLUSERS=1 INSTALLDIR="C:\Program Files (x86)\SAP\FrontEnd\CalSync"' begins
  NwSapFeiUt  1E  MsiAction: Error: This tool requires the VSTO 3.0 Runtime SP1. Please install the VSTO runtime then run this installer again.
  NwSapFeiUt  1E  MsiAction: installation of product CalSync 2.0 failed: 1603
  NwSapsAtlC  1E  Msi install returned 1603: ::MsiInstallProduct() failed

SAP GUI 7.40 including the "Calendar Synchronisation for Microsoft" Outlook add-on

KBA , BC-FES-INS , Frontend Installation , BC-SRV-GBT-CAL , Appointment Calendar , Problem