For Windows users, it is recommended to install iReport directly under the drive to avoid permission issues and ensure you are using JDK 1.5 or 1.6 for compatibility. A Note on Modern Compatibility
Version 4.0.1 introduced several targeted improvements to the reporting engine and designer: jaspersoft ireport designer 4.0.1 download
If you only need the underlying .jar files, they are available on the JasperReports Library SourceForge page . Key Features in v4.0.1 For Windows users, it is recommended to install