[DevExpress Support Team: CLONED FROM Q272041: Install DevExpress Assemblies to the GAC]
For .NET 4.0 you have to change the folder to c:\Windows\Microsoft.NET\assembly, so I did, but it still doesn't work for me
DevExpress assemblies in GAC for .NET 4
Answers approved by DevExpress Support
Hello,
The DevExpress .NET assemblies for version 13.1+ require .NET Framework 4.0+, and it is necessary to refer to the corresponding GAC folder ("C:\Windows\Microsoft.NET\assembly\GAC_MSIL") instead. Please refer to the KA18805: Why DevExpress assemblies are missing from GAC after installing DXperience version 13.1 and higher? KB Article for more information.