remains available online for various versions to help with legacy report maintenance.
You can find download links and guides for through official archives and community resources. Since version 6.6.0 is an older release (October 2018), it is no longer the primary download on the main site, but it remains available for specific database compatibility needs. Direct Download Links jaspersoft studio 660 download link
If the official community sites do not have the installer, some users turn to third-party mirrors. However, exercise extreme caution remains available online for various versions to help