Empty folders.

[dariusity]

Hi, I tried both cloning and downloading .zip file from git but there are no files in the theme folder.

[AethanFoot]

This will because they are git submodules (they point to another git repo), I'm not 100% sure how git handles cloning when there are git modules. But for ease I would just click the folder in github and clone the repos you want to test out.
Actually doing a quick search, adding the flag --recurse-submodules to git clone will download them.
Actually actually if you go to the cloned repo and paste git submodule update --init --recursive will download them to the existing repo.

[sygint]

be sure you use the --recursive flag