If you are unfamiliar with Github, here is an easier download link: https://graceavery.com/touchbar-pet/
- Download the app to your desired location and extract.
- Then, right click (ctrl+click) on the TouchbarPet.app and choose Open.
- When prompted about security concern, go ahead and click on Open.
- Voila
If you're having trouble because "TouchbarPet" can not be opened because Apple can not look for malicious software in it., please read the instructions here before creating a new issue.