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Syncfusion has stopped providing the .NET Framework 1.1 support from Essential Studio version 7.1 and later. So, all the Syncfusion utilities from v7.1 doesn’t have .NET Framework 1.1 support.
Currently we are providing the support for Framework versions 2.0, 3.5, 4.0, 4.5, 4.5.1 and 4.6. Please download and install the latest Syncfusion Essential Studio v188.8.131.52 from the following link and upgrade your projects to the required framework version.