Hi,
There are some crucial files missing such as:
ESP8266_HardSer.h
ESP8266_SoftSer.h
ESP8266.cpp
Thanks for reporting. it will be fixed soon!
Also, in the 0.3.3 release zip, the boards folder is empty.
This is correct. End user don’t need them.
Thanks @Dmitriy, in my existing local folder, I had a “boards_json” folder, is that also unnecessary?
Yeap. You may remove this folder.