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Tips for Removing iTunes 11.4 files to allow a working iTunes 11.3.1 Reinstall
(Thanks to "cwa2" in apple forums for the tip, which helped others with iTunes 11.4 problems.)
"For those with access to the (iTunes) 11.3.1 installer, you'll notice when running it (by selecting "Installer Log" from the Window menu and setting the Detail level to "All Logs") that a number of components are skipped "because the version [newer] is already installed."

In order for all of the 11.4 components to be replaced, in addition to /Applications/, you will need to remove:


Having done that, and re-running the 11.3.1 installer, the buggy 11.4 version will have been removed and 11.3.1 restored.

There have been many problem posts on iTunes 11.4 (see earlier FYI below). I don't know how many had or tried a restore from TM backup instead of the above. But posting it regardless as it has been useful to others that regretted installing iTunes 11.4 and found reinstalling 11.3.1 didn't help due to later files not being overwritten by the older iTunes installer.

iTunes 11.4 update (adds iOS 8 support) [See FYI on Problems below before installing]
(D/L button links to
"About iTunes 11.4
(link disabled as same page URL is used for later iTunes updates)
iTunes 11.4 now supports the ability to sync your favorite music, movies, and more to devices with iOS 8.

File Size: OS X (242.92MB), Windows (111.3MB), Windows64 (112.8 MB)

System Requirements:
- OS X version 10.6.8 or later
- 400MB of available disk space
- iTunes in the Cloud, iTunes Match, iTunes Radio availability vary by country
- iTunes Radio requires OS X version 10.7 or later
- iTunes Extras requires OS X version 10.9.3 or later"

FYI: There's several threads in Apple's forums about an AppleUSBEthernetHost.kext (extension) related error message after updating to iTunes 11.4:

"System extension cannot be used
The system extension "//System/Library/Extensions/AppleUSBEthernetHost.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update."

Example thread links, some with tips (usually deleting the extension and then reinstalling iTunes from a download installer (link above):

I later noticed one post said AppleUSBEthernetHost.kext does not support 32-bit anymore. (Some had said deleting the extension and then reinstalling iTunes 11.4 using the Download installer didn't help on their system.) (Update: See later tips above on reverting back to iTunes 11.3.1.)

Apple Sept 9th Event New Product pages/Press Releases:

BTW: Threads in iTunes forums on problems downloading the free U2 album (Can't download U2 "Songs of Innocence", Songs of Innocence not in library? & Free U2 album) include tips.
(Update: Despite the above posts, apparently Apple received enough complaints from users that didn't want the 'automatic' free album that they posted a URL to remove it from your iTunes library and purchase history. See

Updated Apple Support Articles: (Sept. 9th)

(Topic-based page of Tips, Troubleshooting & How-To Guides for Mac/OS X/iOS Users.)

Other News/Reviews/Updates/Tips/OT:

Recent DIY Articles/Tips/Upgrades/Repairs:
List of Updates, DIY mod/upgrade articles, Tips and more you may have missed. (Mac compatible 802.11ac wifi cards/adapters, DIY Mac Pro 6 and 12-core CPU Upgrades, Mac Pro Northbridge Heatsink Retainer Repair, Mac EFI/SMC/SW updates, OS X Tips, Low-Cost CPU Upgrades for early Mac Pros/Xserves and Minis, Mac Mini SSD upgrades, OS X SSD Trim Enablers, DIY Fusion drives and more.)

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Previous News Archive Summary:
    Monday Sept. 8th, 2014 News
  • Apple's Low-Cost Business Mac: PC Implications
  • 24bit/192Khz audio over HDMI with (late 2012) Mac Mini not supported? (OS X)
  • Sapphire Screens Would Test Apple's Manufacturing and Design Skills
  • GeekBench 3.2 released
  • PCIe SSDs: Samsung XP941 vs OCZ RevoDrive 350
  • Creative Labs (USB) Sound Blaster X7 preview
  • Carmack talks VR gaming's past, present and future
  • Intel Xeon E5 version 3, Up to 18 Haswell EP Cores
  • Review of Epson Expression Premium XP-520 ($130)

For links to older news pages, see the Archives.

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