I have Arduino IDE 1.8.5 installed, and also Adafruit IO Arduino 2.6.0 and Adafruit MQTT Library 0.20.0.
With the Adafruit IO lib comes a set of examples, and I wanted to use example adafruitio_07_digital_out as a starting point for a project on an Adafruit HUZZAH ESP8266.
It won't compile. I get
#error "This sketch requires Adafruit MQTT Library v0.17.0 or higher. Please install or upgrade using the Library Manager."
which I find strange. I've tried installing 0.17.0 instead of 0.20.0, but that doesn't help.
Is there anything I can do to get this to work? The suggested solution of using the Library Manager to install the required package is obviously not working.