After installing Windows 10 21H1 update, I am unable to launch Captivate 2019. The launch window appears briefly, then disappears.
Can you please check the exact version number you are using? You find it under Help, About Captivate.
The most recent version for Windows is 126.96.36.1993.
Bit difficult since you cannot launch Captivate. You may need to uninstall and reinstall in that case. Normally updating is done using Help, Update.