There are 3 usb driver available for your device. Two is for Flashing the Stock Firmware and last is for normal connecting the device to the computer.
Rivo Phantom PZ15 CDC driver For Flashing Firmware
Rivo Phantom PZ15 VCOM driver For Flashing Firmware
Rivo Phantom PZ15 ADB driver For Normal Connecting
How to install driver manually: Step 1: Download and extract the driver on your computer. Step 2: Open Device Manager and Click on Add the Legacy Hardware Menu. Step 3: Click Next. Step 4: Select Install the hardware that I manually Select from a list. Step 5: Locate the extracted driver manually on your computer. Step 6: Click Add. Step 7: Your Driver will be installed and listed in the Device Manager.
Important Notes: [*] Driver Signature Error: If you got Driver Signature Error While installing the Driver then See this Video to fix this problem. [*] If you are trying to flash stock firmware on your device then download CDC and VCOM Driver Only. ADB Driver will not work for flashing the stock firmware. [*] Rivo Phantom PZ15 Stock Firmware: You can download Rivo Phantom PZ15 Stock Firmware from here.