Yeah i understand now, booting with box image and then write image to emmc.
Please note that since this does not contain the factory bootloader, the toothpick method and similar solutions will not work from now on, so if you write LE13 on the eMMC, it is not guaranteed that you will be able to boot older versions.
However, LE 9.2-LTS includes the factory bootloader, so the option to boot from an SD card still remains. The installation solution for this is different for eMMC, but I linked it above.
Btw, is an addon direct download possible for Legacy v9.2 (LTS) builds, like https://addons.libreelec.tv/, if yes whats the url?
Browsing these is disabled due to protection against search bots, but since they are built for a specific version by default, they are available through the built-in repo. Also, they are binaries, so they would probably not work under another version/distro.