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If your customers prefer to run Business Central locally on their own hardware or in other deployment configurations that make an online tenant not relevant, then you can download Business Central for on-premises deployments.
The first release of Business Central for on-premises deployments is available for download on PartnerSource (requires login). For more information, see Deployment of Dynamics 365 Business Central.
Keep an eye out for that page so that you are always deploying the latest update of Business Central.