The download links for the current version of Sapphire are listed below:

Sapphire 0.0.7 Image
Sapphire 0.0.7 Source

The source package contains only the source code for the operating
system, as well as compiling instructions. The image package contains a
1.44 MB floppy disk image to be written to a floppy, or used in an
emulator. If you make changes to the source code, you are welcome to
notify me of the changes via e-mail: [email protected]