Not good enough. You expect your users to rely on your product for their security and you claim to be world leaders in this area. But you don't bother to post clear advisories about an issue which is guaranteed to cause a lot of concern. Not very professional in my opinion.
Same issue for me. I started getting the error message with 3.4.5. I manually downloaded and installed 3.5.1 and it told me that my program was up to date. Then 2 minutes later the out of date popups started again. Clicking on "Check for updates" does nothing.