Arduino Opta IDE PLC Error “error mbed_opta not found and not installed”
If you see this error its an easy fix, the reason you are seeing this error is because you installed the IDE PLC software and Tools, this is a must but what you dont have is mbed_opta this is a standard install for the other Arduino software but its not included with the IDE Opta PLC (not sure why) but all you need to do is open a command using Windows, go to your Windows icon and type CMD, this will open a command prompt window
Now copy and paste this command arduino-cli core install arduino:mbed_opta
Once you have pasted it push enter, this will load the newest version of mbed_opta at this time its 4.1.1 and next time you flash the firmware it should load without issues