Storyline 360 latest build will not launch

I may be experiencing the same issue. I usually don't apply Storyline updates immediately but instead wait a week or so to see if there are issues. The last update was in June, though, so today I applied the update. As soon as I finished, my anti-virus software (Sophos) flagged a "threat detected" message when I launched Storyline, and then Storyline crashes.

I uninstalled Storyline, rebooted my computer, and reinstalled Storyline, but this did not fix the problem. Sophos still flags a threat when I try to launch Storyline and Storyline crashes shortly after, so that it never completes the launch.

Here's a snip from my screen:

I'd like to try rolling back to the previous version. How do I install an older version of Storyline? I'm an Articulate 360 subscriber.

Thanks!

    -Ray