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You can change the Version number of Excel file by right-clicking the file and then selecting Properties > Details and then editing the Version number field. Please use BuiltInDocumentPropertyCollection.DocumentVersion property to change it programmatically using Aspose.Cells APIs.
The following sample code creates a workbook and changes its built-in document properties that include Title, Authors and Version number. Please see the output Excel file generated by the code and screenshot that shows the modified Version number by BuiltInDocumentPropertyCollection.DocumentVersion property.

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