The mesh Enabler Add-in does not currently support Inventor LT. Given the similarity in the part modelling environment between the full version of Inventor and the reduced feature Inventor LT version there would seem to be no technical reason why this is the case.
Please can Autodesk provide the Mesh Enabler add on for Inventor LT.
https://apps.autodesk.com/INVNTOR/en/Detail/Index?id=6950391119076900441&appLang=en&os=Win32_64