How to install Fedora with kickstart file from a running Fedora?

I’m trying to install fedora with SED: Changes/SelfEncryptingDrivesSupportInAnaconda - Fedora Project Wiki

The GUI doesn’t support it, I have to install using a kickstart file.

I checked everywhere, I can’t find how to run the installation with the file. They all say I must change the boot options command to run the installation, which is unpractical.

I can’t believe there is no way to install it from a running Fedora.

Kickstart is design to install a system by booting the installation image.
Either from media (USB, DVD, etc) or from the network.

It is not designed to work from a running system.

You will need to create the install media, on a network server or on a USB driver then boot that. My experience is with kickstarting from network servers. This can be done unattended with the right lights-out-management solutions in a data centre for example.