For macOS 10.10 and later. This script will assist with associating replacement files with a batch of dead tracks. iTunes can perform this task, too, but only one track at a time.
The script will attempt to locate existing files (recursively) in a user-selected folder that have the exact same filenames and extensions as the missing files of a selection of dead tracks. Then, you can determine if the found files are viable replacements for the missing files and the script will perform the replacement. Replacement files remain in their current location and will not be copied/moved to the iTunes Media folder.
This can be a delicate operation. In addition to the must-read documentation included with the script, I also suggest you read what I've written about using this script here.
Watch the video demo below.
Checkmarked tracks will have CPR applied. (Additional screenshots are in the read-me PDF.)
Perhaps Also of Interest...
downloaded 5m 16s ago
Sort purchased tracks into discrete playlists by name or Apple ID
downloaded 2h 15m 36s ago
Change file type to make selected AACs bookmarkable
downloaded 2h 15m 42s ago
Perform search-and-replace on text in your choice of tags
downloaded 2h 15m 55s ago
Set choice of various number tags of selected tracks incrementally
downloaded 2h 16m 3s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 2h 16m 18s ago
Applet assists with swapping, copying, appending data between track tags