I notice you're asking about downloading a specific Juniper vMX bundle file ( vmxbundle-17.1R1.8.tgz — I assume you meant 17.1R1.8 as there is no 171r18tgz version) with "verified" status.

With the verified bundle on your KVM host, you can now deploy the vMX:

: After downloading, verify the file's integrity using MD5 or SHA-256 checksums provided by Juniper. This prevents the use of corrupted or "patched" files from unverified third-party sites, which may contain security vulnerabilities. Installation Highlights

wget --quiet https://internal.juniper.net/software/vmx/17.1/juniper-vmxbundle-171r18tgz

junos-vmx-17.1R1.8.tgz: OK