Quote from: Maxim9437 on January 23, 2019, 06:20:58 PM

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?

You can use either of them.

Litecoin-based variant is legacy software, we have stopped development on this branch, only security updates.
Bitcoin-based is the modern branch, with full development, all features.

But they are compatible to each other.
You are on the same blockchain, no matter what version you use.