iTunes 12.3 installation error on Windows 10

Great...do you know if tthe back ups transfer with migration assistantance???

Not offhand, but if needs be you can copy the entire Apple Computer branch from %AppData% on the old computer into the matching location on the new one and that should then include the iOS backups.

tt2

So where can I find the app data on my windows compute?

I Really need that back up of my old iPhone. The old one is gone...

You can type in %appdata% into the search box in the start menu, or the address bar in Windows Explorer. It resolves to C:\Users\<User>\AppData\Roaming. Apple Computer is inside that. The backup data is stored in C:\Users\<User>\AppData\Roaming\Apple Computer\MobileSync

tt2

Sounds good. I am waiting for it to all transfer to my mac, i will try it soon. But for now I really REALLY appriciate the help! Fingers crossed it work!!

so my iPhone back up stuff is on a folder of my desktop on my mac that I transferred through migration assistance. Do I just plug in my new iPhone?

Ah, see Locate backups of your iPhone, iPad, and iPod touch - Apple Support for more on correct location for the backup set on the Mac. I haven't personally tried copying a backup set from Windows to Mac, but hopefully if the data is put in the right place iTunes will see it and make it available to restore.

tt2

Do you know if there is anywhere my contacts and at least photos might be on my pic from last back up I did?

The iOS device backup format is somewhat obscure and isn't really designed for mortals to poke around in. Assuming you can place the data in the right place so it is detected by iTunes then it should restore to the device as whole. Otherwise there are various utilities that claim to be able to pull particular types of data out of the backup set, but again not anything I've personally had reason to explore.

tt2

Here is a blog post with screenshots on this issue. It seems as though it is still affecting users. Repairing the installer worked for me. http://dirkstrauss.com/itunes-installation-error/

Thanks. Tried lots of things before this. This worked!!

Thank you so much for this advice. I had this problem for months! I had tried everything in the forums and this is the only thing that actually worked. You're the best!