Hi pankajji
you can click on the small spinning globe icon to download the required PAssist_Pro.exe to the correct place
You can click on the little green button to run the plugin and check it completes OK
you'll then have to ensure you put a tick in the box beside its name, tick which shortcuts you require and hit the big blue button to rebuild the iso with that app incorporated.
ps the 'Pin To' shortcuts only work when Run from RAM checkbox selected