I can't download the update. TDU said I had to download the update like 2yrs ago, and when it takes me to a link it's not valid and I can't find the update anywhere.
The official and latest patch is not available from the official website anymore. You might need to use Google Search to look for alternative links. There are a few available and there are also custom patches released for increased compatibility.
Latest official version is 1.66A and the custom version is 1.68b.