I thought there was an issue with the skr pro 2.0. I can’t remember what the issue was though.
I haven’t tried to configure it for that board, but the problems you’re having look like issues with the tools, and not with the firmware. What I would try is to start fresh, with the MarlinBuilder releases firmware, unedited, and just try to compile that. Once you have it compiling, change the board to the 2.0 and see where you hit a wall.
There are platformio instructions in the docs for windows.