potiuk commented on issue #27674:
URL: https://github.com/apache/airflow/issues/27674#issuecomment-1317008681
> We are getting the below error when trying to install the Kubernetes RC
via setup.cfg:
My guess you might have the other RC`s already installed locally and
explicitly that's why they are found by `pip` - but if you do it through extra
and they are not installed manually, `pip` does not find pre-release candidates
automatically - you need to tell it to search also among pre-release candidates
by `--pre` switch of `pip install`.
```
--pre Include pre-release and development versions.
By default, pip only finds stable versions.
```
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