Generally speaking, downloading steam butter dlc may be unsuccessful for the following reasons:

1. Bad network conditions: you can try to change the network or reconnect the network;

2. The 2.steam server is busy: you can try downloading later;

3.Steam client problem: sometimes it may not be downloaded normally because of Steam client problem. At this time, you can try to reinstall the steam client to solve it;

4. Sometimes the game itself may be flawed, which will lead to the failure to download normally. At this time, you can contact Steam customer service and ask them for help.

You can also try to change the time and date of the system, check whether the payment method of the account is correct, and check whether the hard disk space is enough.