As I was reading the latest threads, I realized many users don't know there's Libreelec 19.8 with Kernel 5 with Astrometa DVB-C driver support.
Here's the link: Index of /builds/master/
Please note, this is an update pack only, not a full img also it is not official, so bugs and incompatibility issues might be present.
To be honest, I don't remember how I installed it, but as far as I remember:
Just install the official build with the downloader and get the latest 19.8 update from the link above.
When it booted I used the update manual via Samba share described on this page:
I hope it helped, if I was wrong, then correct me!