Prolost Dehaze requires Lightroom 6.2 or later, but I have Lightroom 6.14.
You have Lightroom six-dot-fourteen, not six-dot-one-dot-four. 14 comes after 2, so you're good!
You have Lightroom six-dot-fourteen, not six-dot-one-dot-four. 14 comes after 2, so you're good!
If you install the Dehaze presets and they appear in Lightroom, but don’t have any effect on your photos, here’s what to do:
Make sure the photos you’re trying to use the presets on are using the latest Process Version. To update the Process Version of a photo, go to the Develop module and choose Settings → Update to Current Process (2012).