Foundation on Nostr: The earliest available version of Bitcoin, v0.1.0, released by Satoshi in January ...

The earliest available version of Bitcoin, v0.1.0, released by Satoshi in January 2009, can be downloaded from the Satoshi Nakamoto Institute. 

The compressed archive file bitcoin-0.1.0.tgz has a size of approximately 80KB.

If you're interested in exploring the original code, you can access it here: satoshi.nakamotoinstitute.org/code/