because Apple only keeps the latest minor version (10.13.6) on its servers. You must retrieve a 10.13.5 image via third-party archives, but extreme caution is needed.
An file is a proprietary disk image format developed by R-Tools Technology . It is used for backing up and restoring entire disk partitions. In the context of macOS High Sierra, these images are often shared on tech forums for Hackintosh builds or to quickly restore a specific OS version without using the official installer. Official Alternatives download macos high sierra 10135 image file rdr hot