You will also need the DMG you wish to restore. My ones are listed here,
Once open click on Tools > Settings and open then Disk Drives tab and change the settings to match the image below,
Now that's done we are ready to restore the image. Locate your USB device in the sidebar of TransMac on the left and right click it then choose, Restore With Disk Image.
Now locate the DMG you choose and open it. This will begin to format the USB and start the restore process.
Once complete you will be able to reboot into the new USB installer. Remember to set the USB as the boot device in the BIOS or press the appropriate key to choose a boot device when booting.
Installed Operating Systems: Catalina 10.15.4 - Windows 10 Pro (Insider)
CPU: Ryzen 5 3600 Motherboard: MSI MPG X570 Gaming Plus RAM: 16GB DDR4 3200MHz Graphics: ASUS ROG Strix RX560
HDD: 960 EVO 500GB - MX500 250GB - 2TB Seagate - 640GB WDC - 500GB WDC LAN: RTL8111 Sound: HDMI
Other: USB Bluetooth - USB Wireless Mouse and Keyboard Bootloader: OpenCore