If you want to try out K, you can either go to Kx and download the 32bit version of kdb+. \ at the prompt (on its own) will enter K mode. This uses K4.
Alternatively, there's the free and open source Kona, which is an implementation of K3, the preceding version.
Alternatively, there's the free and open source Kona, which is an implementation of K3, the preceding version.
https://kx.com/download
https://github.com/kevinlawler/kona