QuickBooks Desktop Error 15240: Causes and Fixes?

QuickBooks Desktop error 15240 is typically associated with payroll updates. It occurs when QuickBooks fails to verify the digital signature on a file. Causes may include incorrect system date and time, expired digital signature certificate, and internet connection issues. Resolving the issue may involve resetting system date and time, updating security certificates, and configuring firewall and antivirus software to allow QuickBooks access to the internet.
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