From this page, you can download the chrip software page.
It only supports the Windows 2000,XP,7.8 and 10 system. but not supports older Windows versions.
I download the latest Widnows Installer.
Install on my computer, and then open the Chrip software. The first step, should download from the radio, choose the radio model Vendor Retevis, Model: RT85 in the pop up window.
Next, program your settsing in the software page.
Finally, Upload to your radio.