Solution: The add-in is unsigned. Open Excel as admin, go to File → Options → Trust Center → Add-ins → Uncheck “Require add-ins to be signed by Trusted Publisher”.
XLOOKUP replaces older functions like VLOOKUP, HLOOKUP, and INDEX/MATCH. Key features: xlookup add in download for excel 2010 free download
Success indicator: If you see no error when typing =XLOOKUP(5,A:A,B:B), the add-in is active. Solution: The add-in is unsigned
If you are looking for a Microsoft-released add-in that gives Excel 2010 the XLOOKUP function, it does not exist. VLOOKUP (right-only lookup):
XLOOKUP is a native function introduced in Excel 2021 and Excel 365. It relies on modern calculation engines that are not present in Excel 2010. Microsoft does not backport new functions to older versions via add-ins.
However, there are two ways to achieve the goal: using a third-party add-in that mimics the function, or learning the "legacy" formula that does the exact same thing.
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