Due to Apple’s deprecation of High Sierra (no longer receiving security updates), the Internet Archive hosts many legacy ISOs. If you choose this route:

Thus, macOS High Sierra 10.13.5.iso is an unofficial repackaging intended for specific technical use cases.

Once you have acquired the macos_high_sierra_10.13.5.iso file, you can install it on virtualization software. 1. VMware Workstation/Fusion Create a new virtual machine. Select "I will install the operating system later".

It supports older MacBook Pro, iMac, and Mac Mini models that cannot run newer operating systems.

macOS High Sierra - Technical Specifications - Apple Support

macOS High Sierra 10.13.5 remains a crucial operating system version for users running legacy Apple hardware, testing software, or configuring virtual machines. Released by Apple as a major stability update, this specific version introduced the Messages in iCloud feature and delivered critical security enhancements.