Articulate Studio update 9 - which option in InstallShield Wizard

Which option should I pick in the InstallShield Wizard when installing the update to Articulate Studio so that I know it got updated?  Add/Remove or Reinstall?  Nothing is wrong with my installation - I just want to update it with the update 9.

I submitted this question on this site over a week ago but it has not been posted:  http://www.articulate.com/blog/studio-09-update-9/

Thanks,

Rachel

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