Enabling Specific Versions of Stable Release

Cleanup + Enabling the download of a specific version of a stable release. If no `version` param is passed, the `LATEST_STABLE_VERSION` is selected.

Note about `STABLE_VERSIONS`: Version `6.0.1` was not listed because artifacts generated in this version do not align with those generated in later versions. In order to reduce the complexity of error handling, this version was skipped.