Problem with itunes after reverting back to mavericks from yosemite

I can't get iTunes to open my library after reverting back to Mavericks from the beta Yosemite. It says "iTunes cannot open this library because it was created with a newer version of iTunes." It then asks if I want to download the latest version and when I click download it takes me to the app store and says that I have the latest version. Which was downloaded when I was running Yosemite. I even downloaded the latest version from the website and it still won't open the library.
Any ideas?
Thanks in advance for your input.
Bob

I don't know which actual versions you are seeing because I don't have Yosemite. You're not really supposed to discuss any issues related to beta test versions on the open forums. I believe there is an iTunes 12 out in beta which may have been what you were running. You don't say how you reverted to Mavericks.
The underlying issue is the file called "iTunes Library.itl" Once you open it with a newer version it can no longer be opened by an earlier version. However, when you do an upgrade it makes a copy of the older version and you can rename this to make a file which can be opened with the older iTunes. However, this will not reflect any changes made to your library. Any media added will still be present in the media folder but it will have to be added to the old library.
https://discussions.apple.com/message/20401436#20401436 - turingtest2 11/2012 post on rebuilding empty/corrupt library from previous iTunes library file after upgrade/crash.
iTunes: How to re-create your iTunes library and playlists - http://support.apple.com/kb/ht1451
Beta software testers are advised not to run software on their main computers, and will usually be familiar with how to restore to older versions and the working of computers. The new public beta with Yosemite is a change in behavior for Apple but of course means a lot of people want to be a tester but don't really know what that means.

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To those who are having problems with itunes after installing new itunes!

i found this solution in another post after much searching. thank you to whoever posted this i didnt write down your name. if you follow step by step it actually works! ty so much mystery person!here is their post:
+**So after contacting apple, heres the solution. Make sure u do all steps, and do both.**+
+**Completely Remove iTunes and QuickTime (Click for more)**+
+**Note: Songs you purchased from the iTunes Store or imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes.**+
+**Quit iTunes.**+
+**On the Start menu, click Control Panel.**+
+**Windows XP and Windows 2000: In Control Panel, open Add or Remove Programs.**+
+**Windows Vista: In Control Panel, click Uninstall a program. Alternately, in Classic View of Control Panel, click Programs and Features.**+
+**Select iTunes from the list of currently installed programs, then click Remove or Uninstall.**+
+**In Windows XP and Windows 2000, when asked if you would like to remove iTunes, select Yes.**+
+**In Windows Vista, if your permission is needed to continue, click Continue.**+
+**After uninstalling iTunes, do not restart if you are prompted to.**+
+**If other entries were present for iTunes remove those as well.**+
+**In Add or Remove Programs or Programs and Features, remove any iPod Updater applications that are listed in the same fashion as iTunes was removed.**+
+**In Add or Remove Programs or Programs and Features, remove any QuickTime installations that are listed in the same fashion as iTunes was removed.**+
+**Restart your computer.**+
+**After the computer restarts, open Local Disk C: in My Computer/Computer or whichever disk programs are installed on.**+
+**Open the Program Files folder.**+
+**Right-click the iTunes folder and select Delete and choose Yes when asked to confirm the deletion. Note: This folder may have already been deleted if iTunes was successfully removed in steps 1-8.**+
+**Right click the iPod folder and select Delete a nd choose Yes when asked to confirm the deletion.**+
+**Right-click the QuickTime folder and select Delete and choose Yes when asked to confirm the deletion.**+
+**Delete the QuickTime and QuicktimeVR files located in the C:\\Windows\\system32**+
*folder.*
+**Right-click on the Recycle Bin and on the shortcut menu, click Empty Recycle Bin.**+
+**Restart your computer.**+
+**Install the latest version of iTunes from http://www.apple.com/itunes/download.**+
+**Empty your Temp directory and restart (Click for more)**+
+**On the Start menu, click My Computer/Computer (or double-click My Computer on the Desktop).**+
+**In My Computer/Computer, open Local Disk C:.**+
+**Windows XP and Windows 2000: Open Documents and Settings.**+
+**Windows Vista: Open Users.**+
+**Double-click the folder that bears your username.**+
+**Windows Vista only: If you see an AppData folder, double-click it and skip to step 12. If you don't see an AppData folder, skip to step 9.**+
+**Windows XP only: If you see a Local Settings folder, skip to step 12. If you don't see a Local Settings folder, proceed to the next step.**+
+**Windows XP and Windows 2000: From the Tools menu, choose Folder Options.**+
+**Windows Vista: From the Organize menu, choose Folder and Search Options.**+
+**Select the "Show hidden files and folders" button.**+
+**Click OK.**+
+**Double-click Local Settings or Local folder (If on Windows Vista, you must first double-click the AppData folder). If Windows needs your permission to continue, click Continue.**+
+**Right-click on the Temp folder and on the shortcut menu, choose Delete.**+
+**In the confirmation dialog that appears, click Yes.**+
+**If you are unable to delete the Temp folder, close all programs, especially those in the Notification area (system tray) of the Windows Task bar shown below and repeat step 10.**+
+**Restart your computer.**+

*UPDATE Cityslacker121 is the MAN!!! He posted in this forum http://discussions.apple.com/thread.jspa?threadID=1165261&tstart=0 that had a link to this http://www.daitengu.com/2007/03/23/howto-fix-the-missing-itunesmsi-problem-on-wi ndows/
the fix is in a link on that page to a windows utility that removes all install info about what ever program is giving you problems so you can run the uninstaller.. The utility is on this page.. http://support.microsoft.com/default.aspx?scid=kb;en-us;290301
Sorry for all the links...

Problem with itunes after reverting back to mavericks from yosemite

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