I liked that website as well. Having scanned more than my share of documents, I think the owner of the Legacy site was purposeful to take down the site's content since only a few pages are in the wayback machine. He did ask for donations, what he did receive, probably did not cover the costs.
One brave OGR Forum member did scan the 2002 Catalogue. Thank you @dastrock !
K-Line 2002 Catalog Second Edition.pdf | O Gauge Railroading On Line Forum