When downloading, ensure you select the correct package for your operating system. It is typically available as a standalone product (based on Eclipse) or as an Eclipse plugin. Most users prefer the standalone "Jaspersoft Studio" executable for Windows, macOS, or Linux.
If your goal is to maintain compatibility with a but you want a newer IDE, you can often use a later version of Jaspersoft Studio and set the "JasperReports Compatibility" version in the settings: tibco jaspersoft studio 6.4 3 download