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Aspose.Slides duplicates UUID of types

Sorry bit of a rooky here! I am trying to get a solution to compile.
It is .Net Framework 4 and references Aspose.Slides 20.10.0.0.
The app build is marked Register for COM interop. It is used in an old application.
When I try to build the app I get:
error MSB3211: The assembly ‘Aspose.Slides, Version=20.10.0.0, Culture=neutral, PublicKeyToken=716fcc553a201e56’ is not registered for COM Interop. Please register it with regasm.exe /tlb.
When I try to register it I get:
error RA0000 : Type library exporter encountered an error while processing ‘Aspose.Slides.MathText.MathLimitLocations, Aspose.Slides’. Error: Type ‘MathLimitLocations’ and type ‘MathHorizontalAlignment’ both have the same UUID

Sorry I am probably being very stupid… but any help would be gratefully appreciated.
Many thanks
Les

@ldcooper,
Welcome to our community! There were many updates after version 20.10. Please try to use the latest version of Aspose.Slides. If the issue persists, please share a simple project reproducing the error to investigate the problem on our side.