Custom skins from Maniapark aren't loading

[Filipe1020]

The big majority of the custom skins I downloaded from maniapark and manialink aren't downloading at all, instead, it just shows the default car with a white color, what could be the cause of that? Ever since the MP4 update got released that I got this problem

[bryan1998]

The models need to be updated for MP4. A few authors have already updated their skins, while others are working on it. GKRacer is updating his, and I updated my M3 to MP4. Sora's latest model (M3 GTR) is also MP4 compatible.