MSI Error 1603: Fatal Error During Installation and How to Find the Cause
Error 1603 is Windows Installer’s catch-all fatal error. Read the verbose log for the action that failed, and check the four causes Microsoft documents.
VSTO Add-in Crash 0xe0434352: .NET Exception Kills Outlook, Word or Excel
Exception 0xe0434352 is an unhandled .NET fault in a VSTO add-in. Repair the runtime, unblock network assemblies and reinstall the add-in properly.
0x80070643 during an Exchange CU: setup fails and rolls the server back
0x80070643 and MSI 1603 abort an Exchange CU part way through. Learn how to read the setup log, find the failing task and finish the upgrade.
MSI Error 1603 and 1618: SQL Server Tools and Update Installs Keep Failing
MSI error 1603 and 1618 usually mean another install is running or a cached MSI is missing. Clear the pending install, repair the cache and rerun the update.