On Linux simply run:
$ curl -fsSL https://get.dronedb.app -o get-ddb.sh $ sh get-ddb.sh
On Windows simply download the precompiled binaries from https://github.com/DroneDB/DroneDB/releases/. Binaries for Linux are also published on that page if you don’t trust install scripts.
On Windows make sure the path to ddb.bat program is in your PATH environment variable.
MacOS support coming soon (help us and contribute a pull request?)