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I make folder in desktop and save json file export from postman.
download 64 bit binary file in windows save in desktop folder.
I aslo set environment variable in my PC of binary file with name docgen.
I open cmd from administration then type cmd echo %docgen% C:\Users\Siraj\Desktop\docgen\windows_amd64.exe docgen build -i input-postman-collection.json -o index.html 'docgen' is not recognized as an internal or external command,
operable program or batch file.