If your mods aren't working after the update you would need to re-download all your cars again from the link in the "Server Information" Discussion, the Discussion is a pinned post so all you would have to do is go to Overview and then click "Server Information". Once you've clicked the Discussion go to the bottom of the page and there will be a link, click the link and it will take you to the Master Drifts download page, from there you download the cars again and copy them over your previous mods.