How to fix faulty assets?

Sorry to bother y'all again but while downloading some more new content yet another problem has decided to rear its ugly head. Multiple new locomotives and rolling stock I have downloaded that were working before are now displaying faulty assets after I downloaded more rolling stock from the same website, If anyone who sees this knows how to fix the whole faulty asset problem then please let me know! Help is much appreciated!
Happy Rails,
Alex

You will probably need to post the KUIDs of the assets and the text of the errors for the faults.

Contact the website, tell them about the faults in their products and ask/tell them do the fixes so that you and every other downloader doesn't need to.