The vendor has stopped maintaining the plugin.
What he wrote in the comments section on his own site:
The simple solution is to uninstall permalink finder. I do not support it and haven’t for over three years. It is the first plugin that I ever wrote and it is not the easiest plugin to maintain.
The default permalink is something like /?p=123. At one point I changed this to another form. This plug-in only looks for similar words in the permalink when comparing the old to the new, so it can't redirect from the default links.
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