The recommended way to use Eelbrain is in a separate Conda environment. First, install the Anacond Python distribution. Then, create an environment file with the libraries you need (for example, use this environment.yml as a starting point), and create the environment:
$ conda env create --file=environment.yml
If you often create new environments, use Mamba as replacement for Conda.
For other ways of installing Eelbrain, see this wiki page.