You can download the github page from -themes.then what you do is extract that file somewhere, then run the install.sh file located directly inside the geany-themes file and it will put all the new themes in the correct place for you.
You can download the github page from -themes.then what you do is extract that file somewhere, then run the install.sh file located directly inside the geany-themes file and it will put all the new themes in the correct place for you.