Thanks for the quick reply.
I understand that Lightroom is part of Creative Cloud - but Lightroom Mobile is very new. As I understand things, LR Mobile only works (past the 30 day trial) if you have a CC license on another machine for it to work with. I found descriptions online of various CC license types that would support LR Mobile running on an iPad - but I didn't see the ETLA license type listed (which is the type of CC license assigned to my Windows PC). Or I simply don't understand what I'm looking at (a distinct possibility).