Trying to install Acrobat XI Pro and installer says i already have a more functional version installed.  What I have installed is Acrobat XI Standard, but I want to install Acrobat 11 Pro.  Do I need to unitstall Standard in order to install Pro?

Yes, you do need to uninstall Adobe Acrobat Standard XI before installing Adobe Acrobat XI Pro.

The Acrobat uninstallation "should not" remove the Pitstop plug-ins but I don't know how PitStop registers it's software plug-ins as being installed either.  You should ask the folks at Enfocus about that item.

PitStop will be installed in the Plugins folder in your Acrobat standard. If you open up the application folder or package and look in the plugins folder you will see a folder called 'Enfocus PitStop' or similar.

If you copy that to your Desktop and then install Acrobat pro, once the install is complete you can then move the folder to the same plugins folder in Acrobat Pro.

It isn't very time consuming to reinstall PitStop if needed. However, I suspect it will survive because Acrobat Standard and Acrobat Pro have the same plug_ins folder (one reason you can't have both).

That could be ok then, I know we get comments from customers when they upgrade Acrobat that PitStop is not there, I guess that's because it's a independent installation in it's own folder

The plug-ins folder belongs to Acrobat so, if you go between Acrobat versions, all plug-ins are always lost. But in this specific case only, going from Standard to Pro of the SAME VERSION, the plug-in may be found.

Good to know, thanks for the information.