1.3 Installing the Driver
After we have Successfully added the new Libraries to the Arduino IDE, we need to install the CH341SER USB Driver in order to Connect to the Arduino D1 Mini.
Got to http://www.wch.cn/download/CH341SER_ZIP.html and click the blue Button as shown in the Image.
Extract the downloaded ZIP with an extractor of your Choice.
Next run the SETUP.EXE and hit Install.
Continue with Install Arduino ESP8266 filesystem uploader