Yes, Google killed it. You won't find it on the official Google servers easily anymore (though archive sites host it). Because it is 32-bit software from 2016, it has some quirks:
Report: Picasa 3.9.138.150 for Windows Picasa 3.9.138.150 a specific build of the popular image organizing and editing software developed by Picasa 3.9.138.150 for Windows
What (like face tags or collages) do you plan to use most? What operating system version are you running? Yes, Google killed it
: All edits are saved in a hidden folder, keeping the original image file untouched unless specifically overwritten. Specialized Tools Picasa 3.9.138.150 for Windows