Confused

I am a total beginner,
I have libreelec running on my HTPC from USB stick.
I have TBS6903 DVB-S2 card. No issues with TVheadend.
I am confused what to use OScam, OScam-EMU or OSemu with softcam.key?!!
which version to download for OSemu or OScam-Emu to work with my configuration?
any suggestion, hint or tutorial
please help

I want to use it with a softcam.key
I already did some search and i found this
OScam is not an emulator so to use a softcam.key file there is two options
1- install OSemu and link it to OScam.
2- Patch OScam with OScam-emu to be able to use Softcam.key with OScam

Is this correct?
I am looking for a tutorial that explain step by step which OSemu or OScam-emu to use/download for libreelec on computer and what steps to configure it with the softcam.key and TVheadend

thanks