QuickBooks may show PS077 during a payroll update when the payroll update cannot download or install properly. Common causes include an inactive payroll subscription, outdated QuickBooks Desktop, damaged update files, or connectivity and security settings interfering with the update. Check your payroll subscription, install the latest QuickBooks release, and retry the payroll update. Restart QuickBooks and repair update-related issues if needed. If PS077 continues to appear, call +1(866)-513-4656 for guidance with resolving QuickBooks Payroll Error PS077 and completing the payroll update.