The Microsoft environment works such that porting of add-ins between different versions of Excel (or different users) may sometimes cause the entire directory Path of the location of the add-in in to be left in the cell that contains the add-in function. This is not a big issue and can easily be fixed.
In a cell that had “=xln(A1)” might display “’=C:\Path To Add-in File\Excel Equation Display\1.1 (With Beam, graph and sheet adaptive number format)\XL_Viking_Display.xlam’!xln(A1)” when the spreadsheet is ported to a different computer or version of Excel.
If this is the case all that needs to be done is to perform a global FIND/REPLACE (Located on the Home Tab and Find & Select Button (for Excel 2013))
In the Example above perform a FIND on “‘C:\Path To Add-in File\Excel Equation Display\1.1 (With Beam, graph and sheet adaptive number format)\ XL_Viking_Display.xlam’!” and REPLACE by nothing. I.E. leave the REPLACE option empty.
This will leave “=xln(A1)” in the cell which will, as normal, display the values of the formula in cell A1. Assuming of course the XL-Viking add-in is installed and activated on the computer.