Hi Jaskel,
Nope your update has went to the wrong Data folder. You will have more than one version on Airnav on your computer if you installed from the disk and then updated to 3.13 or 4.04.
Use windows search to look for Navdata.db3 and you will find all instances of it.
The one you are looking for should be around 51,391KB in size.
Couple of choices
1. Move the correct one into the correct data folder replacing the old one that is in their.
2. Now that you know the location of the data folder download and install into it. Dont have the path going as far as /Data, just go the Airnav/Radarbox and it will install into the dData folder itself.
Alan