Hi @_Ferrari_
The MCU-Link provides USB VCOM support. There is not to much to talk about this feature, it works as a traditional USB to serial adapter.
The simplest way to upload FW is using a USB to serial adapter and setting the MCU into ISP mode, you do not even require a MCU-Link this way. After you generate your hex, bin image, you can use several tools to load the image over UART, like the MCUXpresso Secure Provisioning tool, MCU Boot Utility, Flash Magic.Or even direct BLHOST commands.
The MCU-Link probes, as other probes like the LPC-Link 2, enable you to debug over SWD/JTAG. Currently we do not have a standalone SWD/JTAG GUI programmer tool. There is GUI Flash tool , but it is integrated in the IDE. But, If you buy the MCU-link PRO , you can install to it Segger FW, and get access to Segger programming tools, like the J-Link commander.
All the best,
Diego