As mentioned above, when the i Tunes library is loaded into Serato DJ, we take the track data from the 'i Tunes Music Library.xml' and write this to the Serato database, and .crate files (this occurs when i Tunes files are added to crates) If you move the location of your i Tunes library, the file location won't be updated in Serato DJ straight away, so the first time you open Serato DJ after moving the i Tunes library you'll probably notice a large chunk of (or potentially all of) your i Tunes library is showing duplicates in Serato DJ.This is because Serato Dj is seeing two copies of the same file from separate locations.If you've been a dedicated i Tunes user for a long time, the i Tunes library integration is a great way to bring your music library into Serato DJ in a way that is familiar and easy to navigate with very little library upkeep.Any changes made in i Tunes will be reflected in Serato DJ so you won't be maintaining two libraries.This file only has track info updated when the tags are updated in i Tunes, if the files aren't altered in i Tunes then the info written in this file isn't updated.When Serato reads this file; and loads the i Tunes library, we take all the tag info from this file and populate the library panel with this info, no analysis required to bring this info up in Serato DJ (but you should always analyze new files added to your library).Open i Tunes, play a track or two then close it, a new 'i Tunes Music Library.xml' file will be generated (if you check the file size you should see its come down in size) try load the i Tunes library into Serato DJ again, you should find it loads after doing this.
This file is 'i Tunes Music Library.xml' and it lives in the i Tunes folder.
If you find that your i Tunes library is quite bloated in relation to your library size, an i Tunes library of 20k songs will have a file of around 20-25mb in size so if it's far out of that ratio, it could do with a refresh.
To refresh this file, close i Tunes then head to the i Tunes folder, right click and rename the i Tunes Music file to 'i Tunes Music Libraryold.xml'.
Following receipt of the error message, reboot your router, and temporarily disable your antivirus software and firewall.
Once this is done, try to download the Apple Software Update again.