If the error persists even on "Medium" security, the application might be "self-signed" (meaning the developer did not pay for a verified certificate). Modern Java versions can be extremely stubborn about this.
Your Security Settings Have Blocked an Application: Causes, Implications, and Remedies your security settings have blocked an application exclusive
The word “exclusively” sometimes appears due to a translation quirk. The core meaning is: “This app is not allowed by your current security settings.” If the error persists even on "Medium" security,
If right-clicking doesn’t work: