The Hytera HP-series is the successor to the PD-series. The HP605 is the display-free model equivalent to the PD605. While the radio is part of the "HP" line, the software is often referred to within the Hytera ecosystem as CPS (Customer Programming Software).
Hytera typically distributes professional software through its dealer network rather than direct public downloads for end-users. DMR Hytera programming software for beginners Hytera Hp605 Programming Software
Once you have obtained the legitimate HP605_CPS_Setup.exe file, follow this installation procedure. The Hytera HP-series is the successor to the PD-series