1 . Download and install graphviz-2.38.msi https://graphviz.gitlab.io/_pages/Download/Download_windows.html
2 . Set the path variable
Control Panel > System and Security > System > Advanced System Settings > Environment Variables > Path > Edit add 'C:\Program Files (x86)\Graphviz2.38\bin'
3.Restart your currently running application that requires the path
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