There is, it's literally right there on the home page of the project. You can either copy a URL and download it by cloning the git repo, or you can download the whole project as a zip file. Then you just have to compile it!
I used an 11 year old phone for about 6 months while I waited to get a new phone. I never had any problems with processor speeds despite having about 60% the processing power of a then-current phone.
I think people vastly overestimate the need for a bigger better processor.
If that's the sum total of your reasons for needing a more expensive, less free, less repairable phone, then I have nothing left except to laugh at you.
Yeah but you know what, you always have a home. It is very unlikely the bank will ever foreclose on you, they rarely do that, even in 2008 almost nobody lost their homes.
But me, I lose my home on my landlords whim. At any given time I may have just 30 days to pack my life up and fuck off, and there's nothing I can do about it.
You have stable permanent shelter. Don't undervalue that just because you have to maintain it.