For binary packages the following urls can be used (replace v*.*.* with the latest version):
Windows: https://github.com/veloren/airshipper/releases/v*.*.*/download/airshipper-windows.msi
MacOS: https://github.com/veloren/airshipper/releases/v*.*.*/download/airshipper-macos.tar.gz
Linux: https://github.com/veloren/airshipper/releases/v*.*.*/download/airshipper-linux.tar.gz
Replace v*.*.* with latest to always get the latest release.
For source packages do not use the master branch. Always package latest release either via tag (v*.*.*) or branch (r*.*.*) as master is unstable and contains work in progress features.