>> "However I think it is inconvenience on my part to create a new folder and update the entire application just so that I can update the single .exe file.Would there be any other quick way to single handly send update to my .exe file to all client?"
It's required. Replacing a file on disk erases the old file. wyBuild has not way to know what was in the old file without having a reference to it. Hence us directly telling you (and warning you in-app) that you need to still have the old file so wyBuild can create a small patch.