I have noticed on multiple computers now that the launch window is staying open and changing to the “Download and Install Roblox” window, even after the client has already opened. This has been observed on Chrome and Firefox with extensions disabled.
I assume there’s supposed to be an API that allows the newly opened Roblox Client to talk back to the webpage that opened it and tell it “hey, I opened!”
The issue with that is that such an API doesn’t exist to my knowledge. Launching a Roblox game is essentially a super long url that the client can parse. That’s why chrome, firefox, etc prompt you whether you want to push that link to the Client application.