You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

pymcu-rp2040-toolchain
22.1.7.post4

This version was deleted from PyPI around 2026-06-08. Installing fails with:
$ pip3 install pymcu-rp2040-toolchain==22.1.7.post4 ERROR: Could not find a version that satisfies the requirement pymcu-rp2040-toolchain==22.1.7.post4
View other deleted versions of pymcu-rp2040-toolchain

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2026-06-07/ \ pymcu-rp2040-toolchain==22.1.7.post4
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Or, download files manually

And install manually via pip:
pymcu_rp2040_toolchain-22.1.7.post4.tar.gz (14.4KB)