SOLVED Permanently changing and renaming a theme (Innovation)

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I did all the changes (lines 12, 34, 35 and the folders and file), and it now shows the Innovation theme settings in Templates.

BUT: In Plugins the two files InnovationNNPlugin and InnovationPlugin seem to have a conflict.

I activate InnovationNNPlugin and it disappears from the plugin list. (but the theme settings then appear in Templates).
When I activate the standard InnovationPlugin, which is still shown in Plugins, I get an error message and when refreshing the page, GS crashes/shows nothing any more, no page.

I have to remove the InnovationPlugin.php file to get my website back...

Something seems to compete there.