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This one is pretty straight forward, you can not install if the table already exists. If you uninstalled the module and now you want to reinstall, you must go into your database and delete all tables that go to that module, they will start with 'xoops_osc_
When you delete the tables you will also delete any data that is in those tables, so if you have data in the tables that you need you MUST backup the database before you delete them, so you can restore the data after you reinstall the module.
Hope this helps,
John