Just a guess here . But not all content works together . So your issues may just need to adjust or replace . This has been something I run into with some rails not working well with roadbed or other content made for rail details . My 2 cents
He made some embankments. They are meant for Russian or former Soviet block track which is broad gauge. This helps with getting them to fit well under our standard gauge track.
Look for j_ or put in #211147 into author to search by his UID.