Luminar 4 has disappeared from my plug ins

I have Lightroom Classic and have used Luminar 4 as a plug in with no problems until last few days.

I usually acces it by going into photos-develop and edit but i no longer have option to edit luminar. 

I have tried to reinstall Luminar onto lightroom but keep getting advised already installed.

Has anyone else had similr problems. or any ideas to overcome

Thanks