Update 12.1.1.4 erased all my files (music, videos, playlists, everything). How do I revert to earlier version to get that back?

I opened iTunes tonight to import a CD and it asked me to update. Sure, fine, go ahead. Computer restarts after update and EVERYTHING is gone. I had 20+ videos, over 3k songs, all sorted into playlists, podcasts... it's all gone. How do I get that back? Can I uninstall the update and go back to the earlier version of iTunes? And when I plug in my iPad to sync, will it wipe everything off of there, as well??? I'm a fitness instructor, I have over a year's worth of playlists and routines that are now gone.

You're welcome .  Note, though, that iTunes doesn't really keep "backup files" - it does replicate the library database (iTunes Library.itl) during the installation of an update if (and only if) that update makes a change to the database structure.  The most recent of these was the transition from iTunes 11.4 to iTunes 12.0.  On the basis that:
Computers tend to fail at the least convenient moment
Hard drives fail. Always. You just don't know when its going to happen
There is no process that can be 100% guaranteed not to mess with your data
creating and maintaining a backup of your iTunes library is just about essential. See tt2's notes on Backup your iTunes for Windows library with SyncToy for details of a suitable method.  If you make frequent additions or changes to your library you should refresh the backup every couple of days - at a minimum I'd suggest once a week - and always make sure that the backup is up to date before installing a new version of iTunes.  I actually use two backup strategies - one that runs automatically at 3am every Sunday morning, plus as-needed updates to a second external drive that I use to refresh two other systems that I run iTunes on.

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