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This lost of youtube's compatibility with Kodi is painful. At first it took me a few days to understand that the problems experienced on a number of addons were all youtube related. Then it took me two day's to identify the proper sequence of search terms to find this site. Finally, over the past few hours I reviewed this entire thread and learned to appreciate the amount of resources, talent and energy, required to tackle the problem and provide a solution. However, I am still a little confused on how to implement the solution and would appreciate some assistance, due to the number of different platforms.
Let me summarize the process for a MX/MX2 running Openelec 6.0.1 and Kodi 15.2 .
I would appreciate any corrections and your inputs.

1. Disable all addons that require youtube.(If you try to uninstall youtube it will give you a list)
2. Uninstall youtube.
3. Delete >userdata>addon_data>'plugin.video.youtube' You can access the file on your TV box using your network and the box's IP.
4. Download youtube 5.1.19/5.1.20.1 zipped file and place the zipped file into the tv box's download folder.
5. Install the youtube addon from the zip file location in the download folder.
6. Activate the addon twice using the codes, but you must have a browser on a computer opened to the youtube.com/activation page .

How is the problem? When the youtube.com/activation page is opened, it is a subscription page. What am I missing or not understand?
Thanks,

Update: Please ignore the last sentence. 5.1.20.1 install was smooth and worked without a setup or log in.
Thanks,