i have an Actinium Core v0.18.3.0-unk installed
i want to update my wallet

Current Release - v0.18.4.0 (Litecoin-based variant) & v0.19.0.0 (Bitcoin-based variant)

what version should i use?
v0.18.4.0 (Litecoin-based variant) or v0.19.0.0 (Bitcoin-based variant)?
what is that mean?