The bpftrace project has moved from the iovisor organization to its own
bpftrace organization on GitHub. The old installation documentation link
(https://github.com/iovisor/bpftrace/blob/master/INSTALL.md) is now broken (404).
The project also restructured their documentation - installation instructions are now in the README.md under the “Quick Start” section rather than a separate INSTALL.md file.