Radio module firmware version 0.2.0 is now available

Official Hardware Classic UNO R4 WiFi
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I'm sorry to hear that. The developers of the tool provided advice about the problem with Windows Defender here

https://github.com/arduino/uno-r4-wifi-usb-bridge/tree/main/unor4wifi-updater#:~:text=If%20Windows%20is%20overprotective

If Windows is overprotective click on More info and then Run anyway
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I installed Norton Antivirus on a virtual machine and was able to reproduce the problem:

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I don't have the qualifications to advise you on whether or not you should choose to allow the tool to run.

There is work in progress to allow firmware updates to be installed easily via Arduino IDE and Arduino Cloud just the same as you would do with the "NINA" module on the MKR WiFi 1010 and Nano 33 IoT boards:

so if you don't need to use your UNO R4 WiFi board with Arduino IoT Cloud, ArduinoBLE library, or with SSL certificates then you can continue to use the version of the firmware the board came with until the more user friendly firmware update system is finished.