Hi Wipster,
When you extract the folder, it creates a folder Example\Example . The plugin.xml file needs to be in the base plugin directory, so it should look like this:
/myPathToIlias/Customizing/global/plugins/Services/Repository/RepositoryObject/Example/plugin.php
Yours probably looks like this:
/myPathToIlias/Customizing/global/plugins/Services/Repository/RepositoryObject/Example/Example/plugin.php
(notice the two Example folders)
When uploading the Example directory, first click into the first example and upload the nested example folder
Regards,
Adam