This is the general itch.io discussion board. If you need help from a developer you bought something from, you can try the following:
- Check if they have a comment section / discussion section at the bottom of the project you bought
There should also be a page where you can see individual support emails listed if a developer has supplied one, but I cannot find that page for the life of me. I was certain it was another one than https://itch.io/support, but maybe I am wrong and I just do not have any adresses listed.
In regards to your problem: This usally means either a general issue with the plugin (error in the code/placement in your plugin list/incompatibility with the corescriptversion or other plugins used/wrong iteration of the engine used) or an issue with how to set up the plugin parameters/database or assets needed for the plugin to access.