If you are bound to iReport 5.1.0, use Jaspersoft Studio :
Instead of the .exe installer, download the .zip archive from SourceForge. Extract it to a USB drive or local folder. This bypasses Windows registry corruption issues. download jaspersoft ireport designer 5.1.0
⚠️ iReport 5.1.0 is obsolete (released in 2013). It is no longer supported, lacks security updates, and does not support modern Java versions (Java 8+). Official modern replacement: Jaspersoft Studio (free, open-source). Only use iReport 5.1.0 if required to maintain legacy systems. If you are bound to iReport 5
The developer sets up a specific environment variable, points the application to an old JDK 1.7 installation, and finally, the blue and orange splash screen appears. The legacy reports are saved, the layout is preserved, and the enterprise system lives to fight another day. ⚠️ iReport 5