IB download has not changed in 1.96, but the usual error 056 reasons are a closed market or no market data permission.

First check with the Download script with which assets the download works, and with which not. Then check your data subscriptions, and also check if you have a recent Gateway version. The Gateway log normally shows you what the problem is. If you still cannot find the reason, IB support might help. You can also contact Zorro support with a detailed problem description and the Zorro and Gateway logs, and they'll help too.