general problem:
Timestamps that were issued before 08 / 2015 were issued by Thawte. The period of validity of these timestamps ended with 30.10.2017.
So all installations of older packages will fail.
This is really a big issue.
@Adobe: Workaround? (Of course you can set the system clock to 29.10.2017 - but that is no solution for our thousands of customers!)