Capcom has announced that some of the collaboration DLC in Monster Hunter Rise will be delisted in January.
Collaborations with Sonic the Hedgehog, Universal Studios Japan, and Sengan-en will no longer be available in the game after January 21, 2024.
Players whove already downloaded the content will be able to continue to use it. However, whereas most games and content that are delisted are still available to redownload after theyre gone, this isnt the case here.
Source: N4G PC Monster Hunter Rises crossover Sonic DLC wont be downloadable from January, even if you own it.