Could you change that output for your reply #9 into a code field ? Then it will be in a smaller box and it can be copied.
Use lines with three backslash-single-quotes
```
The large output text
```
In linux I get a few more lines with errors after that. Can someone check in Windows ?
It seems as if connecting to a COM port fails.
Can you try to see if a COM port is installed ? Which usb-serial chip does the ATmega1284P use ? and did you install a driver for it ?