Gail S. answered 01/26/20
Adobe Certified Lightroom Tutor
I believe that LIghtroom CC, the cloud version, will still work as long as you have a connection every 90 days, or so. In other words it only needs to 'phone home' every 90 days. You would need to store Smart Previews on your computer hard drive or a local external drive for certain functions to work accurately.