The company mentioned that some people would be impacted back in June when Hangouts for Android and iOS stopped working, and users were pushed to the standalone Chat clients or the Gmail tab. Ahead of that, Google is advising people to download Hangouts history via Takeout “because some of conversations or portions of conversations won’t automatically migrate from Hangouts to Chat.” The only way to use classic Hangouts today is the website, but that’s set to go away in November.