Im with Windows 7 and the issue is happening there im not sure if it happens in other versions of windows.
Roblox Studio and Roblox when updating and cancelling the download actually it doesnt cancel at all somehow it still on my Task Manager and if i open Roblox Launcher or Roblox Studio it will dont update until i close it in the Task Manager.
Steps to do it :
Open Roblox Studio when updating, Cancel the download.
Expectative : It will close normally
Reality : It will close but it will still appearing in the Task Manager and if you try to open the launcher again it will just dont update until you close the another launcher with the Task Manager
If you want me to send a video of what is happening just ask me im spanish and you will probably dont understand the video but i will send it as well if you ask me to do so.