Prolost Dehaze for Lightroom 6
There is a free preset available for Lightroom 6.14 which provides for removing haze from photos in much the same way as newer versions of Lightroom. It is called Prolost Dehaze and can be downloaded from the Prolost website https://proloststore.com/products/dehaze
I downloaded it a few years ago for use with LR 6.14. It was simple to install. I had no problem using it on a Mac with Mojave and earlier OS. It should also run in Windows environment but I have not tried it.