So you can't use PRO to update the feature.
You have to upload again the zipped shp as Robert LeClair suggested in the first comment.
But remember, if you delete the old one and upload the one in your machine you have to make sure that you haven't done separated updates online and offline.
Otherwise you will lose what is already online.
If so, download the one online, merge with the one offline (checking for duplicate of course) and upload it again.
Hope it make sense.