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This is thing that depends on program. Sometimes you dont need to uninstall old version, sometimes you do. Also if you want to keep old program before instaling new one it depends on program. Some program you only need to save program dir. On other programs you need to copy program dir and backup registry values of that program. Another program maybe copies its files to windows directory when you instal it, so you will need to find those files too. Can you be more specific? Maybe then someone could give more help
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