This is special for previous Sabily user. If you want to upgrade Sabily Gaza to Sabily Manarat, you can follow this command from your terminal. This information is from Mr. Abdelmonam through e-mel.
sudo add-apt-repository ppa:sabily.team/ppa && sudo apt-get -q update
sudo apt-get install sabily
Answer 'Yes' when needed.
This information also can be found on Sabily homepage.
So you don't need to make new installation which will delete your data in the previous version.