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This question was answered by @saurabh:
One-Click apps are meant to be installed during droplet creation only. Beyond that you have to manually install the required app from source/package!
However, if you want to retain your droplet IP etc, easiest method is to rebuild your droplet from scratch. This will install your One-Click app just like a new one.
Needless to mention, you should backup your data before proceeding!