@wilirius, we are on Rackspace as well, and we are wondering if maybe Rackspace made an update to the servers. I’ve been able to update all 3 sites that currently use ACF pro. But with 2 of the sites, we had to spam the product key input a few times before it accepted it. So any that are not taking your product key, just try it a few times, and see if that fixes it.
To everyone else, anyone with this problem, that is NOT using Rackspace, try to enter your product key and update now, so we can determine if this issue is resolved across the board, or only for Rackspace customers.
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