I would maybe try deleting the whole 'oqueue' folder from your addons folder. Then copy the newest version back into the addons folder. Also make sure you're not copying the 'oQueue_1.8.4f' folder, copy the next folder inside called 'oqueue'.
Make sure you're not copying the whole folder like 'oQueue_1.8.4f'. Go into that folder, copy the next folder that just says 'oqueue' and move that to your addons folder.
