Windows Phone SDK 8.0 Setup Failed !

Problem : Got following error, while installing Windows Phone SDK 8.0.
Setup Failed
One or more issues caused the setup to fail. Please fix the issues and then retry setup. For more information see the log file.
0x800b0101 - A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.





required certificate

Solution : Problem solved by changing system date/time six months back.
Following are the steps to change the System Date/Time.

1. In windows tray, right click date and time.
2. Click "Adjust Date/Time"
3. Click "Change Date and Time"
4. Select any date approx. six months back  on the calendar. (e.g. I selected : July 1, 2013)
5. Click OK.
6. Click OK.

Now try running the installer again and then opt for repair option when it asks.

Note: After completing installation, you can revert back date to current date.

Did the above solution help you?