Once LR is installed if you go to "Help", "About LR" it tells you all about the version you have installed and what type of license you have, in my case it says perpetual, I actually wanted to install LR CC as I've decided to get CC so I can get Photoshop CC too and get the incremental updates. I had to reinstall LR to get flickr to authenticate anyway and decided to install the CC version along with Photoshop CC. All installed ok but when I entered my existing license it accepted it but shows I still have a perpetual licence, I'm still using the one month trial version of CC so once I subscribe it may change to CC license, I'll have to wait and see.
Paul