Sorry, you are going to have to be more specific than that. What did not work how? Did Cura crash/stop working when you tried to add instances manually? Did the plugin not connect to your OctoPrint instances? Or did it still connect to the wrong IP? More details, or I cannot help.
If it is all the same to you, please post it now. It should still contain some hints as to how Cura sees the octoprint instances in your network.