Quote from: camargoherrera on December 25, 2018, 10:21:54 AM

Quote from: brakmic on December 22, 2018, 12:44:26 PM

A new version 0.18.4.0 of our legacy Wallet is now available (macOS & Windows binaries, sources for Linux).

https://github.com/Actinium-project/Actinium/releases/tag/v0.18.4.0

I updated my wallet, but it is my curiosity on the requirement of the version.
Has it been a optional (unmandatory) or mandatory upgrade?

We always declare versions as mandatory when they are. However, one should always keep wallets up to date.
Only if you are operating a mining pool you can decide differently. But as a user you should keep it updated.