This may be inconvenient, but I cannot run the .sh file on Windows while working in the Git shell. I probably need to install something, but I thought that Git would support this bash command (I know that Windows does not use sh files).
I do the installation steps from GameClosure , and after $ ./install.sh a window appears with a choice of application to open the sh file (for example, when you try to open an unknown file in Windows, it asks which application should be opened that you would like to use) . I tried to open it using the Git shell, but failed ... What do I need to do to run this file and continue the installation steps from the GameClosure tutorial? **
Here is a screenshot (warning in Polish, but I think you all know this message). 
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