This article shall unravel all these causes and shall also make you a pro at fixing QuickBooks Error Message 1618. The following error message might appear on your desktop screen: Easy fixes for QuickBooks Error Message 1618Users should perform the below given steps for stemming out Error code 1618 when updating the QuickBooksaccounting program. Here, opt for the QuickBooks Install Diagnostic Tool and permit the tool to make any changes to QuickBooks or the system. Upon its successful completion, run QuickBooks and try the update again. This should thwart QuickBooks Error code 1618.