1.add index.php from old to new zip
2.index.php  is just created to redirect to demo/index.php
3.download simplepie using git and delete .git folder, .github folder & installation http://simplepie.org/wiki/setup/setup
git clone https://github.com/simplepie/simplepie.git -b {{VERSION}} (example : git clone https://github.com/simplepie/simplepie.git -b 1.8.1)
4.Release date : https://github.com/simplepie/simplepie/releases
5. PHP REQUIREMENT LINK : https://github.com/simplepie/simplepie#requirements