In these versions our code looks for this directory and fails installation of VRA is this directory is missing.
Manually create the directory 'C:\temp' on the Hyper-V host and install VRA again.
You may be prompted to add additional directories if those are missing as well, in accordance with any errors that may follow.
This behavior is fixed in Zerto version 4.0U2.
Should you still encounter it at this version, consider an intermittent connectivity issue to the host or contact Zerto support for further assistance.