The GDK installation has changed a bit (just set it up today, you need to run gdk install and gdk start (instead of run) for example). Please also note that it involves installing dependencies on your local machine, like e.g. Ruby / Postgres, etc. Here is the link to the GDK: https://gitlab.com/gitlab-org/gitlab-development-kit
Otherwise I would try the docker container OR just install it with omnibus in a VM: https://about.gitlab.com/install/