Can't upgrade from 1.1.12 to 1.2.0a2 due toCould not find poetry-1.2.0a2-darwin.sha256sum file

[motin]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: MacOS Monterey 12.1 (Apple M1 Max)

• Poetry version: 1.1.12

• Link of a Gist with the contents of your pyproject.toml file: n/a

Issue

Can't upgrade to 1.2.0a2 due toCould not find poetry-1.2.0a2-darwin.sha256sum file.

Output from following upgrade instructions on https://python-poetry.org/blog/announcing-poetry-1.2.0a2/

$ poetry self update --preview -vvv
Updating to 1.2.0a2

  Stack trace:

  6  ~/.poetry/lib/poetry/_vendor/py3.9/clikit/console_application.py:131 in run
      129│             parsed_args = resolved_command.args
      130│
    → 131│             status_code = command.handle(parsed_args, io)
      132│         except KeyboardInterrupt:
      133│             status_code = 1

  5  ~/.poetry/lib/poetry/_vendor/py3.9/clikit/api/command/command.py:120 in handle
      118│     def handle(self, args, io):  # type: (Args, IO) -> int
      119│         try:
    → 120│             status_code = self._do_handle(args, io)
      121│         except KeyboardInterrupt:
      122│             if io.is_debug():

  4  ~/.poetry/lib/poetry/_vendor/py3.9/clikit/api/command/command.py:171 in _do_handle
      169│         handler_method = self._config.handler_method
      170│
    → 171│         return getattr(handler, handler_method)(args, io, self)
      172│
      173│     def __repr__(self):  # type: () -> str

  3  ~/.poetry/lib/poetry/_vendor/py3.9/cleo/commands/command.py:92 in wrap_handle
       90│         self._command = command
       91│
    →  92│         return self.handle()
       93│
       94│     def handle(self):  # type: () -> Optional[int]

  2  ~/.poetry/lib/poetry/console/commands/self/update.py:197 in handle
      195│             return self.update_with_new_method(release.version)
      196│
    → 197│         self.update(release)
      198│
      199│     def update(self, release):

  1  ~/.poetry/lib/poetry/console/commands/self/update.py:212 in update
      210│
      211│         try:
    → 212│             self._update(version)
      213│         except Exception:
      214│             if not self.lib_backup.exists():

  RuntimeError

  Could not find poetry-1.2.0a2-darwin.sha256sum file

  at ~/.poetry/lib/poetry/console/commands/self/update.py:260 in _update
      256│         try:
      257│             r = urlopen(base_url + "/{}/{}".format(version, checksum))
      258│         except HTTPError as e:
      259│             if e.code == 404:
    → 260│                 raise RuntimeError("Could not find {} file".format(checksum))
      261│
      262│             raise
      263│
      264│         checksum = r.read().decode().strip()

[motin]

Closing since there is a similar issue for linux with a solution already here: #5025 (comment)

[github-actions]

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