I understand you're looking for a reliable source or discussion regarding JasperSoft Studio 6.6.0 — but I want to be upfront:
https://sourceforge.net/projects/jasperstudio/files/archive/JaspersoftStudio-6.6.0/Scroll down until you see “Older versions (Archives)” – sometimes labeled “Past Releases”. jaspersoft studio 660 download link
If you require this specific version for legacy report compatibility, follow these paths: Commercial/Professional Customers I understand you're looking for a reliable source
Extract/Install: Run the installer or extract the folder to your C:\ or /opt/ directory. Download from: https://sourceforge