: Review the microG Building Guide to set up your local development environment.
: Check the Implementation Status page to see which Google APIs are currently supported and where new features might be needed.
: The most secure place to download microG is the microg/GmsCore GitHub .
What are you planning to develop, or is there a particular Google API you are trying to implement? Releases · microg/GmsCore - GitHub
If you are looking to "develop a feature" for microG, the project is open-source and welcomes contributions. Here is how to get started:
: Verified mirrors like APKMirror and Uptodown also host version history if you need a specific older build. Feature Development for microG