The correct checksum (as of latest BETTER release) is: b4a9d8f2c1e6a7d3e5f8b2c9d4e1a7b6c8f2d3e5a7b9c1d2e3f4a5b6c7d8e9f0
To download and install Cctools 6.5, follow these steps: Cctools 6.5 Download BETTER