I've just tried "LibreELEC-S8X2.arm-8.2.2-S82.img.gz" and I can't get this to boot. Comes up with "File system corruption has been detected!" message. I tried different MicroSD cards and readers, also tried a different PC without luck. After the aforementioned message it will attempt a repair, but this doesn't work.
Also tried Hmeeberg's suggestion .. "LibreELEC-S8X2.arm-8.2.2-MXIII-1G.img". Exactly the same issue as above.
Hence there is something in the boot part of "LibreELEC-S8X2.arm-8.2.2-MXIII-PLUS" that is compatible with my Vega S89 - it boots and installs .. however I don't have the knowledge to know what can be taken from this and placed into the image I want to use (ie. "LibreELEC-S8X2.arm-8.2.2-S82.img").
Cheers.
did you try redownloading the image?