The WireGuard macOS app is unavailable for older operating systems. Please update your operating system if you can. If you are on a macOS High Sierra (10.13) or earlier, then you can still use WireGuard via their userspace drivers via the process detailed below.
Algo generates a WireGuard configuration file, `wireguard/<username>.conf`, and a QR code, `wireguard/<username>.png`, for each user defined in `config.cfg`. Find the configuration file and copy it to your device if you don't already have it.
Note that each client you use to connect to Algo VPN must have a unique WireGuard config.
You'll need to copy the appropriate WireGuard configuration file into a location where the userspace driver can find it. After it is in the right place, start the VPN, and verify connectivity.