I have never used these forums before so if I am posting in the wrong place I am sorry.

Hello! I have been following this project for some time and have finally got around to contributing. I have an old 32 bit raspberry pi 3 (raspberry pi os) with boinc installed. I go to tools > add project. I could not find Minecraft@home in the list so I type in https://minecraftathome.com/minecrafthome/
into the project URL bar, as suggested here (https://minecraftathome.com/minecrafthome/join.php).
I hit enter. A pop up appears that says 'this project may not have work for your type of computer. Do you want to add it anyway?' I click yes.
Another popup. 'the URL you supplied is not that of a boinc-based project. Please check the URL and try again'

Is this a problem with Linux? Is Minecraft@home only available for windows?
Maybe 32 bit is not supported??
Thank you in advance!

Minecraft at home just got arm support for its latest task (so the Raspberry Pi is included), but I believe it's an ARMv8 (64-bit) application, not an ARMv7 (32-bit) app. BUT the Pi3 has 64-bit support so you would just need to install the 64-bit version of Raspbian onto it.

Also just type https://minecraftathome.com or https://minecraftathome.org those worked for me

As of right now, Minecraft@Home supports Windows, Linux, and Linux On ARM64 for CPU and Windows and Linux for GPU (Nvida only, Maxwell 900 series or higher, I believe)