I think for now this works, but later on it could be more robust. A `PEBuild::ArchiveCollection` sounds great. Then it can come down to something simple seeming like maybe a `display_available_installers` and `has_installer?` call. `download_root` options can be additive, and the archive can check a series of locations (if provided by the user). For now I just wanted more info for the user when their desired installer is not available (as per the conversation we had).

Should this be a blocker for a new release of the plugin?