Replace dll in :

1) For WinForm
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\devDept.Eyeshot.Control.Win.v12\v4.0_12.0.239.0__XXXXXXXXXXXXX

2) For Wpf
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\devDept.Eyeshot.Control.Wpf.v12\v4.0_12.0.239.0__XXXXXXXXXXXXX

Enjoy

