Since iTunes 12.2 or later version released, iTunes does not create XML files by default. While AVS4Mac M4V Converter Plus needs to read iTunes Library information through "iTunes XML" file for adding and converting files. If you are encountering some issues like "Can not find iTunes Music Library location" or "File C:\Users\xxx\Music\iTunes\iTunes Music Library.xml not exist" when using AVS4Mac M4V Plus with iTunes 12.2 or 12.3, please refer to this detailed tutorial for fixing these issues.
Step 1 Set Preferences in iTunes
Please open iTunes, go to " iTunes Menu->Preferences -> Advanced ", and make sure the option "Share iTunes Library XML with other applications" was checked. If it is not well checked, please check this option and then click "OK" to save the setting.
Step 2 Quit iTunes.
Step 3 Relaunch AVS4Mac and iTunes to have a try.
If you still can't find the video or add the video in converter, please drag & drop your file(s) to the converter directly.
Haven't fixed your problem after trying the above method? Feel free to contact us via Email: support [at] avs4mac.com (replace [at] as @ before sending message).