Dears,
I downloaded ArcGISEngine101sp1.msp file but i can not install it,
i used msiexec.exe command in command prompt but the error is the same that i double click .
Error:the upgrade patch cannot be installed by the windows service installer service because the program to be upgraded may be missing...
My OS is windows 7 and i installed Arcgis Desktop and arcObject and also arcgis Server,
Thank you for helping.