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 1
When 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 2
When 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.