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I swapped out the 2023 SDK dlls to the new 2025, and I got these errors.
I assume you have followed up with the suggestions in the Microsoft documentation on error 2412,5. What kind of Vault application or extension are you upgrading? Did you update the ApiVersion attribute from 16 to 18? If your application is an Inventor or AutoCAD add-in extension, you need to reference the .NET core versions of the SDK libraries.

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