Setting up the Dlubal API

I want to use the Dlubal API and am already failing at the setup according to the instructions (https://apidocs.dlubal.com/installation_python.html#installation-python).

The point "Create the Virtual Environment" (python -m venv myenv) produces an error message as attached below, please help.

PS C:\Users\a.muellner\Desktop\API> python -m venv myenv
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Program Files\Python313\Lib\venv\__main__.py", line 6, in <module>
    main()
    ~~~~^^
  File "C:\Program Files\Python313\Lib\venv\__init__.py", line 677, in main
    builder.create(d)
    ~~~~~~~~~~~~~~^^^
  File "C:\Program Files\Python313\Lib\venv\__init__.py", line 82, in create
    self._setup_pip(context)
    ~~~~~~~~~~~~~~~^^^^^^^^^
  File "C:\Program Files\Python313\Lib\venv\__init__.py", line 446, in _setup_pip
    self._call_new_python(context, '-m', 'ensurepip', '--upgrade',
    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                          '--default-pip', stderr=subprocess.STDOUT)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python313\Lib\venv\__init__.py", line 442, in _call_new_python
    subprocess.check_output(args, **kwargs)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python313\Lib\subprocess.py", line 474, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
           ~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
               **kwargs).stdout
               ^^^^^^^^^
  File "C:\Program Files\Python313\Lib\subprocess.py", line 558, in run
    stdout, stderr = process.communicate(input, timeout=timeout)
                     ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python313\Lib\subprocess.py", line 1208, in communicate
    stdout = self.stdout.read()
KeyboardInterrupt
PS C:\Users\a.muellner\Desktop\API> myenv\Scripts\activate
myenv\Scripts\activate : The module "myenv" could not be loaded.
If you want more information, run "Import-Module myenv".
At line:1 char:1
+ myenv\Scripts\activate
+ ~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (myenv\Scripts\activate:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CouldNotAutoLoadModule

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