There is only the Generic version for your type of hardware.
Stable: LibreELEC-Generic.x86_64-9.2.6.img.gz
Beta: LibreELEC-Generic.x86_64-9.95.3.img.gz
Look at LibreELEC Downloads – LibreELEC for more installation details.
BTW, your device is already some 13 years old. Our support will not be everlasting.
Thanks for your support