Yeap, with that version the developers of LW try to address all issues some users have/had with the 4.12.3 version.
Whether your Java installation became somehow corrupted when updating to 4.12.3. has to be seen. In any case I reckon to always using the offline installers of programs (whatever program).
The deleting of the preference folder is also recommended to exclude its possible corruption as cause for any trouble. But when doing so, make sure you've notes of your configuration, because afterwards you'll have to re configure LW (i.e. Language, Shared folder, download/upload speed, etc.)
