Use the Juniper vMX Appliance Template from the GNS3 Marketplace to ensure correct Qemu settings.
If you are struggling with a "fix" for this specific image, common issues usually revolve around environment compatibility or corrupted downloads: Platform Requirements jinstallvmx141r48domesticimg download fix
Sometimes, your browser or download manager's cache and temporary files can cause issues. Clearing them might help. Use the Juniper vMX Appliance Template from the