There is no fix - see here: http://answers.ea.com/t5/Battlefield-4/trial-version-of-battlefield-4-code/m-p/4184438#M166754
Usual EA clusterfuckery - turns out the free time offer ended in AUGUST (see http://battlelog.battlefield.com/bf4/news/view/bf4-game-time-for-pc/ - this is the only reference I can find), despite the fact it's still on the front page of the store and available for download...
I've had the same problem for the last two days, spoke to support and was told the same thing (on the second ticket, first guy told me to reinstall. Twice.) Don't waste your time or bandwidth reinstalling, it won't work.
GG EA
