Intel VT-x (or AMD-V) is required for 64-bit guests; Intel VT-d is required for PCIe device passthrough.
Sites like Vetusware or WinWorldPC focus on preserving outdated software. They often host the ISO or EXE for Parallels Workstation (non-Extreme), but the Extreme build is rarer. Search their forums for "13950." Parallels Workstation Extreme v6.0.13950 download
Parallels Workstation Extreme v6.0.13950 was a specialized virtualization solution released around 2011, primarily designed for users who required high-performance, workstation-class computing within a virtual environment. Intel VT-x (or AMD-V) is required for 64-bit