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Thanks for your interest in Aspose.Slides.
As per you query, we investigate Aspose.Total both .zip and .msi format files, regarding .NET Framework 4.0. We have observed that Aspose.Total doesn't contain dlls for .NET Framework 4.0. So you have to download Aspose.Slides for .NET 6.1.0. After downloading and perform installation you will be able to use .NET Framework 4.0 .dlls. You can download Aspose.Slides for .NET 6.1.0 from following link.
Aspose.Slides for .NET 6.1.0
Sorry for your inconvenience.