UPDATED 09/20/2018
Groove Coaster fans we have some good news! The DLC download issue has been resolved.
Please try to re-download the DLC from the store page below.
"DADDY MULK -Groove remix-" Store Page
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News update on the situation the DLC "DADDY MULK -Groove remix-" being unable to be downloaded & played correctly.
We are working together with Valve to resolve the current issue. Although the earliest the DLC may be fixed and ready to be downloaded properly would be tomorrow.
Any new updates on the situation will be posted here.
Please accept our most sincere apologies for the inconvenience and appreciate your patience as we work on resolving the issue.