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Old 30th April 2010, 22:25   #3
redxii
Senior Member
 
Join Date: Nov 2005
Posts: 115
You can simply run the uninstaller of the old version silently ( /S switch) before doing anything else, using the uninstall info from registry to figure out where that older version is installed.

Or you can borrow from other projects.. Filezilla is open source and their script is here: http://svn.filezilla-project.org/fil...?revision=3683. You just have to figure how to work their solution into your script.. depending on your familiarity with NSIS that might be easy or difficult.
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