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windows installer needs to check for previous install
when installing, it is normally good practice to remove the previous instance. i can appreciate this is a lean editor, however, i had the previous instance open and the installer failed because the binary was locked. uninstalling the previous version should alleviate that problem.
Customer support service by UserEcho
The only issue is the one you ran into, which occurs when Sublime Text is currently open. This would also be as issue for an uninstall.