Are you on Windows? Find the executable by going to:
C:\Program Files\Adobe\Adobe Lightroom
Right-click on lightroom (the application) and choose send to desktop
On Mac launch Finder and go to Applications, then double-click on LR6 to Launch.
Control-click on the dock icon, choose Options >> Keep in Dock
On first launch you should get the option to upgrade your LR5 catalog to LR6
You can check your Lightroom version by the following steps:
Windows> Go to help> About Adobe Photoshop Lightroom
Click on Lightroom written on the upper left corner> you will see the version at the first place.
Please let us know if you need more help.
Thanks Sarik, I will check this up. Cristian
The name in the top left corner of Lightroom does not indicate what version of Lightroom you are running. As Sarika said, you must check the version from the Help menu, next to About Adobe Photoshop Lightroom