Hi: The problem is how to get, via Internet, the Android operating system,
version 4.4.2 free of charge. Wikipedia says

Android's source code is released by Google under open source licenses,
although most Android devices ultimately ship with a combination of open
source and proprietary software, including proprietary software required for
accessing Google services.
Now, if I can get the sources then, in principle, I could compile them. But
the probabilities of making an error in the process are high. So,

Question: could I directly get the executable code? And, in the affirmative
case, could I get it for free? In case the target machine minds, it is an HP
notebook (HP Mini 210-1100).