I contacted LibRAW. They state they have included the S5 ii already and it's Affinity Photo that is at fault...
"We do not provide direct user support for other's end user products (with the
exception of ours end-user products, of course). If Affinity takes money from
its users, they should be engaged in support without throwing this ball to
us.
LibRAW is targeted to developers, we're ready to provide support for Affinity team, but they never contacted us.
Please send this link to Affinity team:
https://www.libraw.org/extended-support”
It's ridiculous that a 6-month-old camera is not supported yet. I have a camera that is of no use to me as I work exclusively with RAW images.
I had issues when buying the software. I should have taken the hint and gone elsewhere for my photo editing!