$ cargo install pijul --version "~1.0.0-beta"
See Windows binaries.
If you are lucky enough to already have one version of Pijul, here is how to check the sources out:
$ pijul clone https://nest.pijul.com/pijul/pijul
Or, if you have an account on the Nest, via SSH:
$ pijul clone email@example.com:pijul/pijul
See the manual