The download will not proceed when there is something wrong with the digital signature, say outdated or invalid, causing the error message to pop up. This is where Digital Signatures (As mentioned above) are being verified and carefully checked. Ideally, all downloads from applications are being screened and checked by Windows just before they are downloaded.

Try to check if error message has been resolved.Manually restart your computer by turning it OFF and then back ON.Right click on Apple Software Update and click on the Repair option.Choose Apple Software Update from the list of options.On the ‘Open” space, type in appwiz.cpl then press Enter.On your windows computer, press Windows + R.How to repair Apple Software Update, follow the steps below: Repairing Apple Software Update is perhaps the easiest way to fix this issue and this solution only repairs problems that are only related to Apple Software Update. It is the main application that basically manages all updates for all apps installed. There is a possibility that an Apple Software Update might have been corrupted. HOW TO FIX ERROR “iTUNES HAS AN INVALID SIGNATURE” SOLUTION 1: Repair Apple Software Update

You will find below a few potential solutions that may help resolve error message ‘Itune has an invalid signature”, read on. It may seem that Windows are having some technical difficulties with iTunes update and showing the error message every single time you are trying to update a software. In this case, an error message appears when your computer is not able to detect the digital signature. These are used to authenticate users to protect them from viruses whenever they try to download an application or program. Have you experienced trying to update your iPhone using iTunes and getting error “iTunes has an invalid signature’? This is related to the Digital signatures.

ITunes 12.12.10 for apple instal