When you try to download maintenance releases or payroll upgrades, you get QuickBooks Error 15215. Usually, it occurs because of a clash with another background-running application. The software may be unable to validate digital signatures due to this mistake. One efficient way to fix this problem is to restart the computer in selective startup mode. Do you find QuickBooks difficult to use?  In order to chat with an expert, dial 1.855.738.2784.