1 - Start by downloading a copy of the desired theme installer with the following command:
curl -O https://raw.githubusercontent.com/Ferks-FK/Pterodactyl-AutoThemes/v0.8.2/themes/version0.7.19/YOUR-THEME/build.sh
Note that at the end of the link it says YOUR-THEME, change this part to the name of the theme you want to install.
2 - After the file is downloaded, run the following command:
bash build.sh
3 - Now wait for the script to do its work.
Old themes are no longer supported by the main script.
The main script will still restore a backup of your old panel.