Library not found

First time here, finally got Platform IO running after 3 -4 tries the last 2 years!! It cannot find the library Centipede by Macetech, available at Github and I’m using right now with Arduino IDE.
How do I get it? (Tons of MCP23017 libraries but I want Centipede).

You mean this library, created 6 days ago? GitHub - macetech/Centipede: Arduino library for the Centipede Shield MCP23017 I/O expander by macetech

For libraries that are not (yet) in the PlatformIO library registry, you must add the download link or repo link yourself. See docs.

So here e.g.

lib_deps =
   https://github.com/macetech/Centipede.git

in the platformio.ini, to download it via the git client (that is hopefully installed on your machine).

Otherwise replace the link with the HTTP ZIP download link https://github.com/macetech/Centipede/archive/main.zip, or download the zip yourself and pull the folder inside that zip library into the lib/ folder of your PlatformIO project.