Because this is a legacy FreeBSD-based image, installation varies by hypervisor:
If you have located a file and need to verify its authenticity, the community-recognized checksums are: jinstall-vmx-14.1R4.8-domestic.img Size: Approximately 681 MB MD5 Hash: 85aa3048e8648bf91e893455645cad03 jinstallvmx141r48domesticimg download link
image is highly sought after in the network lab community (GNS3, EVE-NG) because it represents a unique architectural bridge in Juniper's virtual evolution. Need EOL software image | Training and Certification Unlocking the Power of Virtualization: A Comprehensive Guide