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PS D:\Data\python-sample\python> pysetup run bdist_wininst
running bdist_wininst
running build
running build_py
Invalid command install
Traceback (most recent call last):
 File "D:\Data\cpython\lib\packaging\command\__init__.py", line 57, in get_command_class
 cls = _COMMANDS[name]
KeyError: 'install'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "D:\Data\cpython\lib\packaging\run.py", line 653, in main
 return dispatcher()
 File "D:\Data\cpython\lib\packaging\run.py", line 642, in __call__
 return func(self, self.args)
 File "D:\Data\cpython\lib\packaging\run.py", line 91, in wrapper
 return f(*args, **kwargs)
 File "D:\Data\cpython\lib\packaging\run.py", line 288, in _run
 dist.run_command(cmd, dispatcher.command_options[cmd])
 File "D:\Data\cpython\lib\packaging\dist.py", line 709, in run_command
 cmd_obj.run()
 File "D:\Data\cpython\lib\packaging\command\bdist_wininst.py", line 119, in run
 reinit_subcommands=True)
 File "D:\Data\cpython\lib\packaging\command\cmd.py", line 323, in get_reinitialized_command
 command, reinit_subcommands)
 File "D:\Data\cpython\lib\packaging\dist.py", line 660, in get_reinitialized_command
 command = self.get_command_obj(command_name)
 File "D:\Data\cpython\lib\packaging\dist.py", line 583, in get_command_obj
 cls = get_command_class(command)
 File "D:\Data\cpython\lib\packaging\command\__init__.py", line 59, in get_command_class
 raise PackagingModuleError("Invalid command %s" % name)
packaging.errors.PackagingModuleError: Invalid command install
Looking at bdist_wininst.py (line 118) it is indeed trying to use an "install" command, which is not present in command\__init__.py

Closing as a duplicate of #13151, which also identifies other problems with this command.