Upgrade Question/Suggestion

Is there a reason why the 'upgrade to X.X.X' link doesn't go directly to the upgrade page (i.e. https://www.boonex.com/trac/dolphin/wiki/7.3.3-7.3.4 ) instead of the download new version page?

They just typed in the wrong one.  Hopefully Boonex it will see this topic.

1. All my site's Avatars, Profile pics, all profile covers and some thumbnails disappeared.
2. I only find the ".scrutinizer.yml, .travis.yml, CHANGELOG.md, CONTRIBUTING.md, phpunit.xml.dist, README.md" files in my "/public_html/Fresh/Dolphin/plugins/facebook-php-sdk/" folder. So, I assume the files have already been removed from the "public_html/tmp/" by Softaculous?
3. Do I have to remove all the files and folders in the "public_html/tmp" folder or just all the files in all the folders?

Are you sure Softaculous upgraded the site? I've never seen Softaculous support that for Dolphin. You should restore from backup and perform the upgrade steps on the wiki.