Requirements
Step 1 — Make sure all directories are writable.
Login to your Joomla admin area and go to Site >> System Information >> Directory Permission. And make sure all directories listed are writable.
Step 2 — Download the latest version of jCenter here.
Step 3 — Install the jCenter using Extensions Installer in Joomla administration. Go to Extensions >> Extension Manager.
Step 4 — Once jCenter is installed you will be redirected to the Application page. If you cannot see the application table, you can access directly by going to your Joomla administration >> Components >>jCenter >> Applications.
Step 5 — Select which Joobi applications you want to install.
If you have a slower server most large applications will take some time to install because it will retrieve all the data from the Joobi distribution server.