* Virtuozzo / OpenVZ VPS may require /proc/sys/fs/inotify/max_user_watches to be increased by your provider for real-time file monitoring if more inotify resources are required than is set, some providers may not be willing to do this.
Plesk Obsidian 18.0.62+
Linux Malware Detect, ClamAV 1.00+ packages from EPEL or Debian/Ubuntu Repositories
Minimum 3 GB system memory with at least 1 GB free if installing ClamAV (optional)