Reference
Updating PicoBuild
PicoBuild checks for updates automatically and can install them in place.
When a new version is available for your channel, the app downloads the release, verifies its SHA-256 checksum, and applies it — on Windows by replacing the portable executable, on macOS by replacing the app bundle — then relaunches. You're prompted before an update is applied.
You can change the update channel or trigger a manual check from Settings → Updates. Release notes for every version are published on the Changelog page.
