The built in method of plugins being able to be updated via the wordpress admin page requires you release your plugin to the wordpress open plugins platform.

If you have a plugin you want to keep private you have to find another way.

Private plugin updating resources

https://wordpress.stackexchange.com/questions/13/updates-for-a-private-plugin

Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.

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