InstallDir doesn't work

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Make sure InstallDirRegKey isn't setting $INSTDIR. InstallDir only sets the default value of $INSTDIR, in case no other values can be found. The priority of $INSTDIR values, from highest to lowest, is as follows:

  1. Value passed on command line with /D
  2. Value read from registry key specified by InstallDirRegKey
  3. Value specified by InstallDir
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