Hi Albioninoz! Glad to hear you're liking Nightingale!
I believe you should be able to do one of the following to resolve your problem:
First way:
Open Nightingale
Go to Edit -> Preferences
Select the "Media Importer" tab
In that page, change from the "iTunes Import/Export" tab to the "Watch Folders" tab
There, you should be able to change the directory to the new location of your media.
It should look something like this:
Alternatively, if you wanted to re-do the first run setup, clearing *all* of the settings, you can delete the following directories:
Warning: this will delete ALL profiles and ALL settings, so if you use multiple profiles, this method shouldn't be used.
For Windows:
"C:\Users\<username>\AppData\Local\Nightingale"
and
"C:\Users\<username>\AppData\Roaming\Nightingale"
For Mac:
"<Home Folder>/Application Support/Nightingale"
For Linux:
"<Home Folder>/.nightingale"
A final possible solution:
You can try starting Nightingale with a clean/new profile. This can be done by running nightingale with the "-p" flag. Off the top of my head, I can't remember if there is an easier way to start with a new profile on Windows.
Hopefully some of this has been helpful! Let us know how it goes!