Some users have had issues when installing/uninstalling/repairing NI software, that a dialog will appear that asks for installation media for the VI Package Manager Runtime Engine.
To continue, download the VI Package Manager Runtime Engine installers located here:
Then, extract the zip file to a folder and point the "Select Distribution" dialog to that extracted location.
You should then be able to continue the NI software installing/uninstalling/repairing process.
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