in flutter Install App exe is not recognized as an internal or external command operable program or batch file code example
Example: 'flutter' is not recognized as an internal or external command,
1) Make sure that the environment variables are set correctly,
Go to “Control Panel > User Accounts > User Accounts > Change my environment
variables”
Under “User variables” check if there is an entry called “Path”:
If the entry does exist, append the full path to flutter\bin using ; as a
separator from existing values.
If the entry does not exist, create a new user variable named Path with the
full path to flutter\bin as its value.
2) Reboot your computer
Once both above steps are done, run flutter doctor
Note: Run this command in either a Command Prompt or PowerShell window.
Currently, Flutter does not support third-party shells like Git Bash. (Source:
Flutter Documentation)