The installation package for the Mali Offline Compiler contains everything you need to start compiling OpenGL ES shader code and OpenCL kernels on a desktop computer.
You should have downloaded the installation package appropriate to your platform. The Mali Offline Compiler is available for Windows, Linux, and macOS. On Linux and Windows it comes in both 32-bit and 64-bit variants. On macOS only a 64-bit version is available.
Typically, you should download the package that most closely resembles your host environment. If you aren't sure which package to choose, the 32-bit version will work across the widest variety of platforms.