I want to warn users of the perils of the Lightroom 6 trial. I installed it with a new, empty catalogue to try it, didn't like it and uninstalled it. I then found all my custom settings for LR5 had also been uninstalled. I've managed to recreate most of them but my Custom Colour Label Set is gone. I've recreated it manually, but EVERY SINGLE COLOUR LABEL I HAVE EVER APPLIED HAS BEEN LOST. The lesson is clear, if you are going to install a trial version of Lightroom, do it on a computer that doesn't have your working copy on it.