No, it is not working. I just updated to version 4.3.3 half an hour ago, and the update took my entire site down, including the back-end. I had to FTP in, rename the theme folder to disable it just so I could get into the back-end, and restore the old version of the theme from backup.
I am back to using version 4.2.1, and no one above has said they have successfully installed 4.3.3 — they only got their site working by rolling back to the previous versions.
Please take this new update down until the faulty code is fixed.