I’ve installed the app manually.
~/frappe-bench$ cd apps
~/frappe-bench/apps$ git clone https://bitbucket.org/logedosoft/jettaslama.git --origin upstream
~/frappe-bench/apps$ cd ..
~/frappe-bench$ ./env/bin/pip3 install -e apps/jettaslama/ --no-cache-dir
~/frappe-bench$ echo "jettaslama" >> sites/apps.txt
~/frappe-bench$ bench --site gta.logedo.com install-app jettaslama
Source: App download from my repository - #19 by revant_one
Thank you @revant_one . You are a life saver.