'SOLIDWORKS 2015 Constant type library not found in visual studio

Hello,

we just upgraded from 2012 to 2015 SP3.0 and all my stand alone apps are failing.

I tried updating the COM references but the 'SOLIDWORKS 2015 Constant type library' is not showing up in the Add Reference list.

I can see 'SldWorks 2015 Type Library' but not 'SOLIDWORKS 2015 Constant type library'.

I'm using Visual Studio 2015.

any help would be most appreciated

SolidworksApi macros