Osclass has moved to Shopclass — https://github.com/mindstellar/shopclass
This maintenance release repoints the built-in updater at the new repository. It changes only the update-source URL and the version; nothing else is touched. After installing it, your site will receive all further updates from the shopclass repository.
Prerelease channel now carries Shopclass 5.3.0.dev3 (the modernised, rebranded release). Stable installs will be offered the next stable Shopclass release when it is published.