installer not getting the latest files from repo (poetry new --readme argument missing and not defaulting to markdown)

[tekdj7]

• 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 Big Sur 11.5.2
• Poetry version: 1.1.8
• Link of a Gist with the contents of your pyproject.toml file: N/A

Issue

• Installed Poetry via the curl command
• poetry new --help, does not show the --readme argument.
• new.py file that was installed on my computer to /Users/<USER>/Library/Application Support/pypoetry/venv/lib/python3.9/site-packages/poetry/console/commands\ is missing the --readme argument code.
• Yet, new.py on GitHub has the --readme argument code.
• I'm sure the same applies to other files, but didn't dig further. Please look into why the 1.1.8 poetry version being installed via the curl command, and/or using install-poetry.py is not getting the latest files from your Git repo.
• FYI, ran into this, because was trying to get poetry to create README.md, instead its still creating for me, README.rst. Per pull-request 2768, support for readme markdown was included here.

[tekdj7]

Grouping dependencies doesn't work either, the --group argument not available with the poetry add commands, etc. Though in your documentation, it should exist.

[finswimmer]

Hello @tekdj7,

this is expected. The install script installs the latest stable release by default. The features you are missing are included in the preview release. You can install it with curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py | python - --preview

fin swimmer

[github-actions]

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