Please check for previous installation. It is so easy for any programer to accomplish.
Store Installation Path in the Registry. On next installation, check to for Registry to see if it has been previously installed. If previously installed, populate the installation path with existing path.
Simple!
I install my apps on the D-Drive. This product has been available for several years now because I've been using it and have included many suggestions since then. This is a no brainer, therefore, should be easy to do. It makes the application much more desirable for those that already have it installed.
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