QuickBooks Error 15103 is an issue related to updating the software. When this error occurs, it indicates that the update process couldn't be completed due to some issues. To resolve this problem, you can try the following steps:
Update QuickBooks using the manual update method.
Run QuickBooks as an administrator.
Disable your antivirus temporarily during the update process.
If the error persists, consider reaching out to QuickBooks support or checking relevant forums for additional solutions.
