See CHANGELOG.md. Verify what you download: carry SHA256SUMS beside the file and ask it about that file, grep " iirds.pyz$" SHA256SUMS | shasum -a 256 -c - — -c on the whole file fails on the assets you did not take. The .pyz needs only a Python — python iirds.pyz your-package.iirds. On PyPI this release is iirds; iirds-validate and iirds-sdk are compatibility names that install it. Upgrading an environment that has iirds-validate 0.4.2 or earlier: pip uninstall -y iirds-validate first, then pip install -U iirds. If you already ran pip install -U iirds-validate and no command runs, pip install --force-reinstall --no-deps iirds restores it. Installs that began at 0.5.0 or later are unaffected.