The latest major versions are in the 8.x and 9.x range (e.g., 8.2, 9.0, 9.2). Version numbers like "6.6.0" do exist historically, but "66.0" appears to be a typo or misunderstanding.
Use 6.6.0 only for maintaining existing legacy reports. For new projects, download Jaspersoft Studio 9.x from the official TIBCO website. tibco jaspersoft studio 66 0 download link
Added the ability to import PDF and SVG files directly into reports. There is no official version "66
Ensure you are using Java 8 (OpenJDK or Oracle JDK). Version 6.6.0 will fail to launch with Java 11 or higher. Search tips:
Complete integration with JasperReports Library 6.6.0 .
files are parsed—replacing older Apache Commons Digester parsers with Jackson XML—older templates often require full recompilation to run on newer engines. For organizations running older JasperReports Servers