Fixes & improvements:

• fixes admin stats #25
• fixes installation system (javascript & html issues)
• fixes a bug when a style requires a disabled plugin.
• improve style system caching.
• adds a one-click delete all files to users' files page.
• adds a hint of the ability to use {username} as a folder name (i.e. uploads/{username}).
• fixes a bug where queue system is not working if website is on maintenance mode.
• some other improvements for PHP 7+

Features (included Plugins):

• klj_ftp: supports uploading to multiple servers using FTP.
• advanced_extras: a very advanced replacement for Kleeja extra header and footer (good for ads).
• rebrandly: supports rebrandly.com, where you can shorten your links using your short domain.
• adfly: add adfly ads to your website.
• pdf_viewer: add a PDF viewer to your download page.
• AMP support: make your website SEO friendly by supporting Google AMP format.
• video_player: let users play videos/audio from download page.
• traidnt_arbah: supports Traidnt Arbah program for ads.
• kj_download_speed_limit: set download speed limit for each group.
• kj_ban_admin: protect admin panel from unwanted login attempts.

Thanks to @munjoob and @MitanOmar.