According to https://support.smartbear.com/downloads/testcomplete/chrome-patches/, Chrome v 64 shouldn't have any problems with that version of TC.
The question is, though... what do you mean by "no longer working"? What error messages are you getting? What's happening when it tries? It's entirely possible that Chrome changes some of the way that the Alert's are identified in memory which would mean that Aliasing/NameMapping would need to be updated or some other code changes would need to be made to support the latest Chrome version.