Steps to download a local copy of the vSAN HCL database file
If the below error message appears while trying to update the HCL database manually, collect vCenter logs and open a ticket with VMware support for assistance.'Unable to update the release catalog. Check the vSphere Client logs for details.'
If you get the following error message 'Failed to decode the HCL DB' when uploading file, open the link another tab and copy the text into notepad and then save file as all.json.