I had been using Elements 13 in my Lightroom 6 as an editor. I signed up for the trial version of creative cloud and now the only option I have is Photoshop. Elements is gone but my NIK options and ON1 are still available. How can I get Elements back into the "edit in" tab? Can I have both PS and Elements at the same time? I like Elements because it's familiar and easy for quick edits.
You may add Photoshop and Elements as an external editor in Lightroom.
Please check the following article for how to add an additional external editor : Adobe Photoshop Lightroom Help | External editing preferences