If you have a newer Java version installed, you must install JDK 7 separately and point iReport to it. System Specs
Here is a quick guide on why you might still want it and how to get it running today. What’s New in 5.1.0? download jaspersoft ireport designer 5.1.0
iReport Designer v5.1.0 Release Notes - Jaspersoft Community If you have a newer Java version installed,
Designed for older environments; it typically requires JDK 1.5, 1.6, or 1.7 and may fail to open or function correctly on modern Java versions (like Java 8 or higher) without specific configuration. Download and Official Sources How to install iReport in Windows it typically requires JDK 1.5