Trying to install worklight studio 7.1.0.0-MFPF-StudioP2-IF201512271725 on my eclipse Mars.2 Release (4.5.2) but for some reason the archive installation is hanging at org.eclipse.jst. please refer screen shot attached, Can anyone please suggest what could be done to resolve this
It is always suggested to use the latest. Right now you're not doing.
You can get the latest from Eclipse by clicking on Help -> Eclipse Marketplace and search for "mobilefirst".
Alternatively if you are an IBM customer you can visit the IBM Fix Central website and download the latest available iFix for the Studio component.