Apple does not publish version history. Some third-party sites (e.g., those tracking app version history) may host older .dmg or .pkg files. Exercise extreme caution with such downloads, as they may be outdated, incompatible, or modified with malware.
Risks include:
Check your Purchased tab in the Mac App Store
Apple hosts all .pkg files for MAS apps on a content delivery network (CDN). These URLs follow a pattern, but they require a legitimate purchase receipt (a valid appStoreReceipt). You cannot simply browse the CDN like a web server. However, third-party sites sometimes capture these URLs for specific versions. For example:
http://osxapps.itunes.apple.com/apple-assets-us-stable...
Searching for strings like "Apple Configurator 2.10.pkg" on GitHub Gists or Reddit sometimes yields working links. Always scan any downloaded PKG with Malwarebytes before opening.