1. First backup your website before to update a theme. your theme setting will be safe but if any theme file was modified then it will replace after upload. now follow below step to upgrade
2. Download latest theme file and upload to extension -> installer page.
3. after that go to extension -> mazaengine and complete all upgrade step.
4. after upgrade finished, clear all caches including your browser cache

Maybe your server does not support webp image format. so go to extension -> mazaengine -> system -> asset and disable webp option