geotechnicalfunctions.dll problem in KeyLAB

We can't get our geotechnicalfunctions.dll add in to load or stay loaded when excel starts up.  We are currenlty running 64-bit Excel 

From Microsoft:  for an add-in to work with the 64-bit version of Office , it needs to be recompiled by the developer specifically for the 64-bit version of Office

Have you tested the compatibility with 64-bit M365 apps? 

Are any other users having this same issue and if so, what was the fix.

we have tried installing the latest version of KeyLAB, but the .dll still will not load