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I've downloaded GTK# 2.12.20 for .NET and installed it from monodevelop.com.
Upon attempting to install monodevelop 4, the installer fails to recognize that GTK# is present on the system.
Restarting the system does not seem to help.
This is on Windows 7 (x64) Pro
The attached screenshot contains a the Programs and Features window in the background, displaying that 2.12.20 has been isntalled.
The command line is "dir \windows\assembly\GAC\g*"
And the window on top is the error from the installer.
Created attachment 3745 [details]
the missed screenshot
I had the same issue. I was able to workaround by intalling from CLI using the /passive flag.
msiexec /i XamarinStudio-4.0.1.msi /passive
Could you try again by removing all existing GTK# installations and installing http://download.xamarin.com/GTKforWindows/Windows/gtk-sharp-2.12.21.msi?
Had the same issue. Instructions on comment 3 worked for me.
I had this issue with GTK# 2.12.22 and the suggestion from comment 2 solved it for me.
Can't be reproduced anymore. Closing for now.