You can get Wren:IG application in a few ways.
Download binary release
The easiest way to get the Wren:IG is to download the latest binary release.
You can also run Wren:IG in a Docker container. Official Wren:IG Docker images can be found on Docker Hub.
Build the source code
The last but not least you can create your own build from the source code. Manual how to build the source code can be found here.