@Risk/DTS: "Error 1304. Error writing to file OptQuestNET.dll."

Here’s a concise <160-character version: Error 1304 occurs when .NET 4.0/4.5 isn’t installed. EXE installer adds it automatically; MSI requires you to install .NET first.

Dec 18, 2025
Knowledge

Title

Answer

Applies to: All products, releases 7.x

Error:

"Error 1304. Error writing to file OptQuestNET.dll. Verify that you have access to that directory."

Cause:

This error indicates 7.x .NET 4.0 or 4.5, is not installed on this computer. Our EXE installer installs it automatically.

If you're using an MSI installer, you need to install .NET and other prerequisites before running our installer.

URL Name

error-1304-error-writing-to-file-optquestnetdll

@Risk/DTS: "Error 1304. Error writing to file OptQuestNET.dll."

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