For V4 I think it might be best to do a fresh install.  Create a dummy folder and inside that create a new test file: New Text Document.txt.  Rename that file Poser.exe.  Install V4 with all of her other packages.  Morph ++, etc.  Then you can move the contents of the dummy folders into your Poser - whatever version -  Runtimes.

Be certain to maintain the folder structures and keep all the files in relative path statements.

For future re-installs you may want to back up the dummy Runtime to a CD-ROM or backup folder and keep those original files.  That way you won't have to face the DAZ installers again.

Best Wishes,
Rªnce