Article ID: 2897627 - View products that this article applies to.
Consider the following scenarios in which you try to install the Windows Phone Software Development Kit (SDK) 8.0 on a computer that is running a 64-bit version of Windows 8 or Windows 8.1.
Scenario 1When you use the installation DVD, the installation is unsuccessful and the product is only partially installed. Additionally, you receive the following error message:
A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.
Scenario 2When you use the web download, the bootstrapping application cannot download the Win8SharedSDKTools.msi file. Additionally, you receive the following error message:
Unable to locate package source.
To work around this problem, follow these steps:
Known issue with this workaroundIf you try to repair the Windows Phone SDK 8.0 installation, the repair is unsuccessful. To repair the installation, we recommend that you uninstall the product and then reinstall it.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.