Upgrade Lightroom from 3.6 to 7.1.1
I just shifted from Macbook OS X 10.6.8 (Snow Leopard) to Macbook OS X 10.10.5 (Yosemite) and find that while Photoshop CS is no longer operative, Lightroom appears to be. I have an old version (3.6) and am wondering if it will actually work, or whether I should upgrade to the latest version 7.1.1. I went on the Lightroom website to see about an upgrade and it gave all the information except for the price. I never really used Lightroom on my old Mac, but since Photoshop CS did not migrate over and Lightroom did, I plan to start using it. Any ideas? Thanks!
MacBook, Mac OS X (10.6.8)