After many revisions, tweaks, and testing the official JUKI release of QCT4 is ready! Yes, this is a free upgrade even if you have QCT4 already. You will want to check to insure you have the most current revision. You will need to be connected to the internet. Additionally, you can check at anytime to see if you are current with the most up to date JUKI QCT4. Click the link below to read or print a PDF with upgrade instructions.