Not possible to download as a single zip file using force.com application.

If you want cloud based only, you will need to integrate with another platform (Amazon Web Services, an external web server, etc) to send the attachments to that platform, then zip them on that platform, and then present the download/link from that platform.

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Salesforce MVP | Lightning Champion | 17x Salesforce Certified | Application Architect | 7x Trailhead Ranger | Techforce Services | Australia

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