System:
	
	
	
		
	
	
	
		
I tried to open the installer that gave me error:

I try then to run
	
	
	
		
[have to cut here because max length of post 10000 chars}
-------------------------------%<------------------------------------
				
			
		Code:
	
	# lsb_release -a
Distributor ID: Debian
Description:    Debian GNU/Linux 8.11 (jessie)
Release:        8.11
Codename:       jessie
	
		Code:
	
	# plesk version
Product version: Plesk Obsidian 18.0.28.3
     OS version: Debian 8.11 x86_64
     Build date: 2020/07/20 10:00
       Revision: 861e495ebbce7febb7b504319bc78be0e28c97fa
	I tried to open the installer that gave me error:

I try then to run
		Code:
	
	# apt update
Ign http://mirror.hetzner.de jessie InRelease
Hit http://mirror.hetzner.de jessie Release.gpg
Hit http://mirror.hetzner.de jessie Release
Hit http://autoinstall.plesk.com jessie InRelease
Hit http://security.debian.org jessie/updates InRelease
Ign http://autoinstall.plesk.com jessie InRelease
Hit http://autoinstall.plesk.com jessie InRelease
Hit http://autoinstall.plesk.com jessie InRelease
Hit http://mirror.hetzner.de jessie/main amd64 Packages
Hit http://mirror.hetzner.de jessie/contrib amd64 Packages
Hit http://mirror.hetzner.de jessie/non-free amd64 Packages
Hit http://mirror.hetzner.de jessie/main i386 Packages
Hit http://mirror.hetzner.de jessie/contrib i386 Packages
Hit http://mirror.hetzner.de jessie/non-free i386 Packages
Hit http://autoinstall.plesk.com jessie InRelease
Hit http://autoinstall.plesk.com jessie InRelease
Ign http://autoinstall.plesk.com jessie Release.gpg
Ign http://autoinstall.plesk.com jessie Release
Hit http://autoinstall.plesk.com jessie/all amd64 Packages
Hit http://mirror.hetzner.de jessie/contrib Translation-en
Hit http://mirror.hetzner.de jessie/main Translation-en
Hit http://mirror.hetzner.de jessie/non-free Translation-en
Hit http://security.debian.org jessie/updates/main amd64 Packages
Hit http://autoinstall.plesk.com jessie/all amd64 Packages
Ign http://http.debian.net jessie InRelease
Hit http://security.debian.org jessie/updates/contrib amd64 Packages
Hit http://autoinstall.plesk.com jessie/all i386 Packages
Hit http://security.debian.org jessie/updates/non-free amd64 Packages
Hit http://security.debian.org jessie/updates/main i386 Packages
Hit http://autoinstall.plesk.com jessie/all i386 Packages
Hit http://security.debian.org jessie/updates/contrib i386 Packages
Hit http://autoinstall.plesk.com jessie/all i386 Packages
Hit http://security.debian.org jessie/updates/non-free i386 Packages
Hit http://security.debian.org jessie/updates/contrib Translation-en
Hit http://autoinstall.plesk.com jessie/all amd64 Packages
Hit http://autoinstall.plesk.com jessie/all i386 Packages
Hit http://security.debian.org jessie/updates/main Translation-en
Hit http://http.debian.net jessie-updates InRelease
Hit http://autoinstall.plesk.com jessie/all amd64 Packages
Hit http://autoinstall.plesk.com jessie/all amd64 Packages
Hit http://security.debian.org jessie/updates/non-free Translation-en
Hit http://http.debian.net jessie Release.gpg
Err http://autoinstall.plesk.com jessie/extras amd64 Packages
  404  Not Found [IP: 2a02:6ea0:c700::3 80]
Err http://autoinstall.plesk.com jessie/extras i386 Packages
  404  Not Found [IP: 2a02:6ea0:c700::3 80]
Ign http://autoinstall.plesk.com jessie/extras Translation-en
Ign http://autoinstall.plesk.com jessie/all Translation-en
Hit http://http.debian.net jessie-updates/main amd64 Packages
Hit http://http.debian.net jessie-updates/contrib amd64 Packages
Hit http://http.debian.net jessie-updates/non-free amd64 Packages
Hit https://repo.cloudlinux.com stable InRelease
Hit http://http.debian.net jessie-updates/main i386 Packages
Hit http://http.debian.net jessie-updates/contrib i386 Packages
Get:1 https://repo.cloudlinux.com stable/main Translation-en [146 B]
Hit http://http.debian.net jessie-updates/non-free i386 Packages
Hit http://http.debian.net jessie-updates/contrib Translation-en
Get:2 https://repo.cloudlinux.com stable/main Translation-en [146 B]
Hit http://http.debian.net jessie-updates/main Translation-en
Hit http://http.debian.net jessie-updates/non-free Translation-en
Get:3 https://repo.cloudlinux.com stable/main Translation-en [146 B]
Hit http://http.debian.net jessie Release
Get:4 https://repo.cloudlinux.com stable/main Translation-en [146 B]
Hit http://http.debian.net jessie/main amd64 Packages
Hit http://http.debian.net jessie/contrib amd64 Packages
Get:5 https://repo.cloudlinux.com stable/main Translation-en [146 B]
Ign https://repo.cloudlinux.com stable/main Translation-en
Hit http://http.debian.net jessie/non-free amd64 Packages
Hit http://http.debian.net jessie/main i386 Packages
Hit http://http.debian.net jessie/contrib i386 Packages
Hit http://http.debian.net jessie/non-free i386 Packages
Hit http://http.debian.net jessie/contrib Translation-en
Hit http://http.debian.net jessie/main Translation-en
Hit http://http.debian.net jessie/non-free Translation-en
Fetched 6,783 B in 2s (2,746 B/s)
W: Failed to fetch http://autoinstall.plesk.com/pool/PSA_18.0.28_3654/dists/jessie/extras/binary-amd64/Packages  404  Not Found [IP: 2a02:6ea0:c700::3 80]
W: Failed to fetch http://autoinstall.plesk.com/pool/PSA_18.0.28_3654/dists/jessie/extras/binary-i386/Packages  404  Not Found [IP: 2a02:6ea0:c700::3 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
	[have to cut here because max length of post 10000 chars}
-------------------------------%<------------------------------------
