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I am not very clearly with question. One SQL Server instance only can install Tabular model or Multidimensional model. If you would like to upgrade SQL Server version, you could download the installer from this link.
If you would like to incrementally load, you could use the Process Add processing mode. For dimensions, adds new members and updates dimension attribute captions and descriptions. For measure groups and partitions, adds newly available fact data and process only to the relevant partitions.
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