Cannot Install El Capitan

I’m trying to sell a 2009 MacbookPro. It’s the model MacbookPro5.5 and Apple supports macOS El Capitan 10.11 as latest available version.

Installing El Capiton on an old Mac Book Pro today, I received the error: OS X could not be installed on your computer No packages were eligible for install. Contact the software manufacturer for assistance. EL CAPITAN ERROR SOLVED: You should change the clock to 5 years backThis copy of the Install OS X El Capitan application can't be verified. It may have been. Download OS X El Capitan. In your Mac/existing Hackintosh/virtual machine running Mac OS X, open the Mac App Store app and download the latest version of OS X El Capitan. This is a 8 GB download, so it's probably going to take a while. Once the Mac App Store app finishes downloading OS X El Capitan, an update window will pop up. I'm trying to reinstall Mac OS X El Capitan on my 2009 MacBook pro. Disk Utility lists a single SSD with a capacity of 250.06GB and a single partition (OS X Base system) that is taking up 249.85GB. When I try to create another partition it says that I need to enable journaling, but the option is greyed out.

I’ve wiped all data from the installed SSD and had to boot from an external disk. Now I’ve got two problems:

I’ve only got a Mac with Big Sur and Apple Silicon. I cannot use the package installer from the download provided by Apple to create the installer App for El Capitan. However, I need access to the installer so that I’m able to use the createinstallmedia command.
The 2009 MacbookPro is already wiped and has only access to the recovery mode. You cannot execute the package installer in Recovery Mode to extract the media.

Cannot Install El Capitan On Ssd

Luckily I’ve found this blog post from Chris Warrick who explained how to extract the installer App from the package:

Attach an external Disk which contains the downloaded pkg from Apple. You’ll need enough space on that Disk to extract the pkg and it needs to be writeable
Open the Terminal from inside the Recovery Mode
Go to the mounted volume
Extract the package:

Now we can try to create the install media from the installer app. Make sure you’ve attach another disk which can be overwritten by the installer. In this example its named “MyBlankUSBDrive”:

The InstallESD.dmg image is missing, which we’ll need to add to the right location:

Now we’ll have a valid installation medium which can be used to start the installer from. You can reboot from that disk and should be able to install El Capitan.

However, I’ve encountered another annoying issue which caused the installer to fail:

El Capitan Installer cannot be verified

Install El Capitan Os

Oh great… On to the next commands you can try from the Terminal inside the Recovery OS:

installer -pkg /Volumes/Mac OS X Install DVD/Packages/OSInstall.mpkg -target /Volumes/'XXX' where XXX is the name of the disk you’re installing to.
Wait for the installation to say it’s complete. You will not see any sort of progress display.

Great, you’ve got El Capitan installed! Apple had some issues with certificates and people found a way to either use the above commands for installation or you’ll have to tinker with your Macs time settings so that the signature is valid again. I would have expected that Apple resigned all installers so I wouldn’t have to use these commands at all but doesn’t look like they did.

Installing El Capiton on an old Mac Book Pro today, I received the error: