Simply rename the most recent backup to “iTunes Library.old,” and then copy this file to the iTunes Music folder. Note that if you've attempted an iTunes upgrade, your existing library is backed up and indexed by date in the Previous iTunes Libraries folder. Right-click the “iTunes l” file and choose “Rename” from the context menu.Ĭhange the file extension from “.itl” to “.old”. Press “Windows-E” to open File Explorer, and then browse to the C:\Users\Username\Music\iTunes folder location, replacing “Username” with your Windows username.