You can uninstall the SpreadsheetWEB Excel add-in from the Apps & Features page in Windows 10. Open this page either by searching in the Windows search bar, or by right-clicking the Windows icon on the bottom-left corner, and selecting Apps & Features.

In the Apps & features list, find the item SpreadsheetWEB Wizard and select Uninstall.

This will remove the Excel add-in from your computer.