For anyone interested in a free for non-commercial use IDE that's not based on Eclipse, try Segger Embedded Studio.
It seems to install the needed debugger support files, but has issues anyway.
This product is certainly not a turn-key installation. Next I tried an STM32 Nucleo board, but had the same issue with starting debugging after telling it I now have an ST-Link debugger. I'd probably have an easier time resolving this issue if it would tell me which 'additional DLL's' are needed. Possible Reasons: - Driver DLL could not be found in the specified path - Driver DLL requires additional DLL's which are not installed - Required Hardware Drivers are not installed Debugger aborted ! The file 'C:\Keil_v5\ARM\Segger\JL2CM3.dll' does exist, so something else must be going on. Code: Error: Cannot load driver 'C:\Keil_v5\ARM\Segger\JL2CM3.dll'.