Unfortunately, I can not recommend upgrading to 7.19 because of the known issues https://docs.mendix.com/releasenotes/desktop-modeler/7.19#known-issues
Best would be to wait for the next stable release.
There is a known issue in Mx 7.19 regarding outgoing certificates.
I think it depends on how big your app is and what you are doing with it. I updated an app that is under development. It is now running on 7.19 and we don't see any issues. But you should try on your own.