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I'm trying to make an installer that first renames a file in a certain location then copies something to that location, therefore replacing the old file and creating a backup. I want to also be able to select the root folder and then the installer have to go into all sorts of other folders. What installer can I do this easily with?

I've been trying Inno; no luck with the back up.

My first thought (for your backup file) would be to write a batch file that runs after the installer's done. Install your "new" file with a different name than you eventually want, then use the .bat to rename the "old" file and then rename the new file.