I can add version 1.0 but not version 2.0 from the version 4.4.1 download.
C:\Program Files\Aspose\Aspose.Cells\Bin\Net2.0>c:\WINDOWS\Microsoft.NET\Framewo
rk\v1.1.4322\gacutil.exe /i Aspose.Cells.dll
Microsoft (R) .NET Global Assembly Cache Utility. Version 1.1.4318.0
Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
Failure adding assembly to the cache: Unknown Error
C:\Program Files\Aspose\Aspose.Cells\Bin\Net2.0>cd ..\Net1.0
C:\Program Files\Aspose\Aspose.Cells\Bin\Net1.0>c:\WINDOWS\Microsoft.NET\Framewo
rk\v1.1.4322\gacutil.exe /i Aspose.Cells.dll
Microsoft (R) .NET Global Assembly Cache Utility. Version 1.1.4318.0
Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.
Assembly successfully added to the cache