I got the New Version message below when I opened LR5.3 and installed LR5.4 OK on my desktop running Win 8.1
I have an iPad 4 and I'll be going on a trip next month. What do I load on it to use it?
Support for Lightroom mobile, a new service to access, organize, edit and share your images from mobile devices.
Fixes for bugs introduced in earlier versions of Lightroom 5.
Camera support for many new cameras, including the Fujifilm X-T1, Nikon D4s, and DJI Phantom quadcopter.
Current version : 5.3 (build 938183)