Nonono, if you say you already tried some things with PlatformIO I assume it’s installed in VSCode as an extension. That’s all the base installation you need. The PIO Home page has a “Open Project” button. You just need to download / clone the above Git repo (e.g., download + unzip https://github.com/maxgerhardt/pio-m5stack-paper-test/archive/refs/heads/main.zip) and use that Open Project dialog. After a bit of waiting for the index rebuild (bottom taskbar), you should be able to use build + upload just fine.