I create a new add-on for Kodi/LibreELEC ... here's the summary:
Subsearch is a SubDL subtitle search and download add-on for Kodi 18 on Linux. It has been tested with Kodi 18.9 and LibreELEC 9.2 (Linux 4.19.127) on a Raspberry Pi 3. It may also work on older Raspberry Pi models, such as the Raspberry Pi 1 and 2.
Available at https://github.com/johann52505/subsearch
Feel free to try & reach out.
JCA