On Windows 7 and 10 I occasionally I have an install (calibre and others) pop a message telling me to do a restart. I ignore them and do what I normally do: Move the install from my Downloads directory to my Software directory, and start the app at my leisure.
FTR : I don't use desktop shortcuts to start programs, I use the task bar or start menu -- although I don't pretend that would make a difference, they're all shortcuts. And I never use the 'start the app now' option from an install, which means for calibre I always have to uncheck that option Ψ³ And I always install software immediately after a reboot, so for something like calibre, remnants can't have been running.
BR
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