I recently added Skylum’s Creative Kit Tonality to my workflow. It is an excellent tool to create black and white photos. I had been using the Nik Software Silver Efex Pro but Tonality is so much cleaner. The Photoshop plugin  installed without a hitch but I couldn’t get the Lightroom classic plugin to install. The option was greyed out. I contacted the customer service and I got a very quick answer from a guy called Konstantin. He sent me some links and the instructions to install the plugin manually. I’d like to share the method with you here.

First of all, close Lightroom.

The first file to download is the .lrtemplate file: here or here 

The second file is the .lrplugin file : here or here

Open two instances of the finder (right click : new finder window). Go to the downloads folder on one and in the other, click on Command+Shift+G and enter ~/Library/Application Support/Adobe/Lightroom/External Editor Presets/ and hit Go.
Copy the Tonality.lrtemplate file from the download folder to the new one.

In the same manner, with the two instances of the Finder application open, leave one pointing to the downloads folder and in the other, click on Command+Shift+G and enter ~/Library/Application Support/Adobe/Lightroom/Modules/  and hit Go.
Copy the Tonality.lrplugin  file from the download folder to the new one.

Now launch Lightroom classic and it should be possible to edit photos in Tonality straight from Lightroom using the Files/Plug-in Extras menu.

The method on Windows must be similar if the plugin doesn’t install, you just need to find the correct path to place the two downloaded files.