Hi Alberto,
Please verify if the Excel folder exists in the installation directory at C:\Program Files\ANSYS Inc\v2xx\Addins\MSExcel with all subfolders and dlls. Additionally, on the main Workbench window, ensure that the Microsoft Office Excel icon is activated by going to View > Toolbox Customization and enable the visibility of Microsoft Office Excel Component by checking the box next to it.
Regards,
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