Update to 4.6.0 – linux-blender – app manager doesn’t start

Hi, I have tried to update following “Updating for New Versions” my linux (opensuse 15.5)-blender(4.0.2) installation but the app manager doesn’t start neither from blender button nor running from the verge3d dir:
python manager/server.py BLENDER I’ve found somewhere in the forum.
the first opens the browser telling:
App Manager Connection Error
Could not connect to the local server!
Please launch App Manager from the modelling suite, or via desktop icon / Start menu.
from the command line I get:

 File "manager/server.py", line 432
    async def runAsync(self, func, *args, **kwargs):
            ^
SyntaxError: invalid syntax

with the system python 2.7.18

with python 3 (3.6.15) instead python3 manager/server.py BLENDER gives

Traceback (most recent call last):
  File "/opt/blender/verge3d_blender/manager/lib/importlib_metadata/_compat.py", line 12, in <module>
    from typing import Protocol
ImportError: cannot import name 'Protocol'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "manager/server.py", line 27, in <module>
    from mako.lookup import TemplateLookup, Template
  File "/opt/blender/verge3d_blender/manager/lib/mako/lookup.py", line 13, in <module>
    from mako import exceptions
  File "/opt/blender/verge3d_blender/manager/lib/mako/exceptions.py", line 12, in <module>
    from mako import compat
  File "/opt/blender/verge3d_blender/manager/lib/mako/compat.py", line 68, in <module>
    import importlib_metadata  # noqa
  File "/opt/blender/verge3d_blender/manager/lib/importlib_metadata/__init__.py", line 18, in <module>
    from . import _adapters, _meta, _py39compat
  File "/opt/blender/verge3d_blender/manager/lib/importlib_metadata/_adapters.py", line 8, in <module>
    from ._compat import pypy_partial
  File "/opt/blender/verge3d_blender/manager/lib/importlib_metadata/_compat.py", line 15, in <module>
    from typing_extensions import Protocol  # type: ignore
  File "/opt/blender/verge3d_blender/manager/lib/typing_extensions.py", line 246, in <module>
    class _ExtensionsSpecialForm(typing._SpecialForm, _root=True):
AttributeError: module 'typing' has no attribute '_SpecialForm'

some hints?
thanks
luca