invalid signature 12.3.1
iTunes download failed 12.3.1- invalid signature.?????
iPhone 6s, iOS 9.2
iTunes download failed 12.3.1- invalid signature.?????
iPhone 6s, iOS 9.2
Try the steps suggested here:
Fix unexpected quits or launch issues in iTunes for Windows - Apple Support
If you can't install or update iTunes for Windows - Apple Support
Also, this thread may be helpful:
"iTunes" has an invalid signature. It will not be installed.
Hope this helps!
invalid signature 12.3.1