Click EFI>EFI>CLOVER and Right click>Compress CLOVER >upload to the Forum using its button to browse to source of the file and upload.Dark icon of EFI partition of your El Capitan disk will appear on the Desktop.Right to the above click on 'Mount Partition'.From the divided window that pops, locate your Elcapitan System disk in the bottom half of the window as 'EFI on EFI yourElCapitanDiskName.'.'TOOLS' bar has important tools like 'Mount EFI', Clover Themes Editor, Install/Update Clover (EFI boot-loader from Sourceforge.Net) and two arrows, one to download ist from the disk and one to upload the edited ist back into the disk's EFI/CLOVER.Launch CCV and find its Menu(Sections)/TOOLS bar on the Left Panel.If not already done, click 'Finder>Preferences' and click and place Hard Disks External Disks to get their icons displayed on the Right side of Desktop for easy access to mouse click navigation.Download Clover Configurator Vibrant (CCV) DOWNLOAD to current El Capitan.Since CLOVER is in a hidden EFI folder of Disk's EFI partition, you will have to mount EFI of your current El Capitan System HDD using Clover Configurator Vibrant.

If you want detailed help, post your Current CLOVER as zip file and list ALL your current BIOS options used under 'Peripherals' menu.

Yes, you can upgrade El Capitan to High Sierra if the hardware in your profile is what you want to upgrade from El Capitan to MacOS High Sierra 10.13.0.

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