If using ESXi Server to deploy NSM On-Prem 3.2.0 OVA file, while deploying the OVA file, we get an error "A required disk image was missing" . In order to fix the error, unzip ova file to get the three files to upload instead of the OVA file.
vmdk file
nvram file
ovf file
Steps to unzip OVA file for deploying NSM On-Prem 3.2.0 on ESXI server:
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1- Open WinRAR and WinZIP app on your machine. Open the downloaded OVA file for NSM On-Prem 3.2.0 downloaded from mysonicwall.com in it.

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2- Extract the following three files and save it.

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3- Now login to ESXi Server and proceed with the deployment of NSM 3.2.0 as shown in KB : Â How to Deploy NSM On-Premises 3.2.0 on VMware
Choose the three extracted files instead of OVA file in step 2 of the deployment KB article as shown below:

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Rest of the steps is same as described in the On-Prem 3.2.0 Deployment KB.