Meta Data for manual lenses

Hi Community,

How do I collect metadata in lightroom using M42 (vintage manual focus) lenses? I'm using version 4.1 Do I need to install classic lightroom?  Does classic LR have features not available on version 4.1? If so, how do I install classic on my Mac Book Pro version 11.0.1. ? Sorry for so many questions.  

Thank you 

KB