In version 18.4, one of the features is the new Twitter X icon (Font Awesome), however I've updated to the latest version and the new icon is there (tooltip shows x-twitter) but the logo isn't right. See screenshot below. Just wondered whether this is just me or perhaps a glitch?
Did you install the full version?
If you have used the incremental update then you will have to manually copy the new fontawesome files. to the right folder.
I meant, there is also an "update only" file, this only includes the executable.
If you did download the full setup, then you can try to uninstall the previous version first.
Also, make sure you run the setup with admin permissions.