HVR for Azure was previously provided by Fivetran in the Azure Marketplace. It appears that the image referenced in their documentation is no longer available. This image is provided by Fivetran so you will need to work with them if you want it back on the Azure Marketplace. You can create a forum post or open a support ticket with them.
Alternatively, you can try to follow the directions to Installing HVR on Azure Manually.
Hope this helps! Let me know if you have any more questions.
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