Hello!
today I am dealing with an error which probes that even in a large and bureaucratic enterprise like Microsoft, move to fast makes you do some mistakes.
In my case I am trying to install Windows Phone 8 SDK and I meet the following error:
“A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.”
WHAT ?!?!
After reading the installation log, I see that… the certificate with which the SDK is installed > is invalid!
To install this I’m using the original ISO file released almost a year ago (1.5 GB approx), kind of poorly packaged no?
Luckily for me, the solution is easy, download the SDK AGAIN from here and that’s it … unless you live in Mordor like me, and download 1.5Gb again is not an quick task.
By the way, nobody told you the fellow that temporary certificates… are, as temporary!
Download: http://www.microsoft.com/en-us/download/details.aspx?id=35471
Greetings @ Home
El Bruno
El Bruno 
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