Hi
I am hoping this might be useful to someone out there ?
I performed a fresh install of Arduino 2.3.6 on a Win10 PC that has never had it installed
I added the DUELink board package & Library as shown in the DUELink Arduino Guide..
I then installed the latest version of the DUELink Board package
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In Arduino IDE I then selected the DUELink board & serial port .
When i then Clicked the VERIFY button i got the following error …
fork/exec {runtime.tools.STM32Tools.path}/win/busybox.exe: The system cannot find the path specified.
Compilation error: fork/exec {runtime.tools.STM32Tools.path}/win/busybox.exe: The system cannot find the path specified.
To resolve this I had to add the STM32 MCU Based Boards package to the Arduino Boards Manager & then restart Arduino IDE.
Next I installed the latest version of the STM32 MCU BASED BOARD package
Now When VERIFY button is clicked the error message is no longer shown
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Following the above DUELink Arduino Guide I copy/pasted the example code into the Arduino IDE.
I then made sure the the DUELink board was in DFU Mode & Clicked the UPLOAD button.
I then got the following error….
STM32CubeProgrammer not found (STM32_Programmer.sh).
Please install it or add ‘/bin’ to your PATH environment:
https://www.st.com/en/development-tools/stm32cubeprog.html
Aborting!
Failed uploading: uploading error: exit status 1
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After downloading the STCUBE Programmer software ZIP file from …
https://www.st.com/en/development-tools/stm32cubeprog.html
Once downloaded I extracted the files from the Zip & ran the .exe file to install.
I just accepted all the defaults & after a few moments the installation was complete
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Now when I click the UPLOAD button the demo code compiles without any error & this is the result

Success!!