What version of Lightroom? The plugin installs automatically from 6.7 / 2015.7.
Have you looked in File > Plugin Manager to see if the plug-in is present?
I'm using what appears to be the latest 2015 version on a Mac. At least the Downloader says it's up to date, abd finding my way to the Plugin Manager, there is no sign of the plugin?
In Lightroom, look at Help > System Info. The first line should state the exact version number: CC 2015.8.
In Plugin Manager, Adobe Stock should be at the very top of the list of plugins (left column).
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There's your answer - you have an old version of Lightroom CC 2015.0.1. For some reason the Creative Cloud app isn't detecting you need to update it.
I think the easiest way to fix this is to uninstall Lightroom from using the Creative Cloud app, then install it again.
That got it. Thank you so much.
Okay, million dollar question..... how does one go about uninstalling Lightroom from using the creative cloud app???
Perhaps an even better question is: why can't we simply install the Adobe Stock plugin?
I have the latest version yet ni plugin..
Lightroom version: CC 2015.9 [ 1106920 ]
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.12 
Application architecture: x64
Logical processor count: 2
Processor speed: 2,1 GHz
Built-in memory: 4 096,0 MB
Real memory available to Lightroom: 4 096,0 MB
Real memory used by Lightroom: 217,7 MB (5,3%)
Virtual memory used by Lightroom: 2 568,1 MB
Memory cache size: 76,0MB / 852,2MB (8,9%)
Maximum thread count used by Camera Raw: 2
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 22MB / 2047MB (1%)
Displays: 1) 1440x900
Graphics Processor Info:
Check OpenGL support: Failed
Vendor: NVIDIA Corporation
Version: 3.3 NVIDIA-10.2.34 310.90.10.05b54
Renderer: NVIDIA GeForce 320M OpenGL Engine
Application folder: /Applications/Adobe Lightroom
Library Path: /Users/Gabby/Pictures/Lightroom/Lightroom 5 CatalogOLD-2.lrcat
Settings Folder: /Users/Gabby/Library/Application Support/Adobe/Lightroom
1) Aperture/iPhoto Importer Plug-in
2) Canon Tether Plugin
5) jf Facebook
6) Leica Tether Plugin
7) Nikon Tether Plugin
Config.lua flags: None
AudioDeviceName: Built-in Output