WinSCP v6.1.2 triggering reboot

Hi

I'm seeing that WinSCP v6.1.2 is triggering a reboot of machines it is deployed to. It returns error code 1641 on deployment, and in event viewer on a target machine I see the following:

The process msiexec.exe has initiated the restart of computer PC01 on behalf of user NT AUTHORITY\SYSTEM for the following reason: No title for this reason could be found
Reason Code: 0x80030002
Shutdown Type: restart
Comment: The Windows Installer initiated a system restart to complete or continue the configuration of 'WinSCP'.

Is this expected behaviour?

Did you install WinSCP using MSI? Is this happening (only) right after the installation?

Yes installed using MSI, and yes it happened only after installation.

Is it a new installation? Or upgrade?
The installer deploys a drag&drop shell extension. When upgrading, that usually requires a restart, as the old extension is loaded into Windows Explorer. The normal installer is optimized not to replace the extension, unless there's a new version of it. So the restart is needed rarely on upgrade. But the MSI installer probably does not have this optimization.

It was an upgrade. Thanks for the insight.