If you are a business with a legitimate need to access old Pro/ENGINEER data, you should contact PTC Support. They can assist with license transfers (if you own a legacy license) or migration paths to Creo, which can open older Pro/ENGINEER files.
If you legally own a license (a floating license file from 2009), you can install Wildfire 4.0 64-bit on a Windows 7 Virtual Machine using Oracle VirtualBox. This isolates the old FlexNet server from your main OS. You can find the original ISO files on the PTC archive if you have a paid support contract (Customers can log into support.ptc.com to download old releases).
If you are a student looking for free parametrics, Onshape (founded by former PTC CEO Jon Hirschtick) is the cloud-based successor. It is truly free for public documents and runs in a browser (64-bit ready).
You specifically asked for the 64-bit version. This presents a significant technical hurdle:
