I'm helping someone recover BSV sent to pubkey in 2010. For several other Forkcoins, I managed to do this by downloading the full client (Forked from Bitcoin Core), importing the pubkey, and syncing. For BSV, I can't get it to work. It seems like it's not just a Fork from Bitcoin Core, and I can't get it running.

Any help recovering those 12 year old BSVs is appreciated