Lightroom app compatibility between MacBook Pro and iPad Pro

I purchase Lightroom for ipad a year ago. I would like to use on my macbook pro. Do I need to purchase a different version to beable to use on both devices? Every time I try to log into Lightroom on my macbook under restore purchase it says I need to purchase a subscription. My renewal is coming up soon and I am unsure if the Lightroom for ipad app is what I need. Any advice is greatly appreciated.