instaltion: per hand: just copy my github https://github.com/akadon/Marlin_N32 into https://github.com/MarlinFirmware/Marlin.
Linux:
git clone https://github.com/MarlinFirmware/Marlin .
git checkout 441416728cd7f0e9b6ebf94f895d1d27fe59d25a # latest commit at this time (tested works)
git clone https://github.com/akadon/Marlin_N32 Marlin_N32
cp -r !(.git/*) Marlin_N32/* .
Dont forget to change platform to STM32F103RE_creality_maple
picture guide: