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Few of my friend once again got certificate problem after last patch, solution to it is below:
1 .Download certificate from link below:
2 .Once downloaded on HDD open it and install.
3. press NEXT
4. Chose "Place certificates in the following store" than press "Browse"
5. Chose "Trusted Root Certificate Authorities" than OK
6. press NEXT and FINISH
This should solve this problem, at least it did for my friends and me in the past.