Having said that, you might be able to install and run Lacerte 2019 (and other new software) on Window 7 but they just won't get any support if you run into problems.

Since you can't test that until next year when the 2019 version is released (and there will be subsequent update that Windows 7 may or may not support), you may be taking a bit of a gamble in case things don't work out mid-seas and you have to scramble to upgrade all your machines.