Hello Huafei,
Thanks for considering Aspose.
Please download the latest version of Aspose.Pdf for .NET 4.1.1 from here and try using it. It's available for .NET Framework 1.1 and 2.0.
In case you face any problem or you've any further query, please feel free to contact.
Nayyer Shahbaz
Support Developer, Aspose Sialkot Team
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