Unfortunately, some items disappear off the web. We have no control over that. That being said, there have been a number of forum software upgrades over the years, and along with that, changes to internet protocols and browsers.
I just had a look at the top pinned item. Further down in the posts, the original URL was fixed. I just copied that into the first post. The person's own website is not available, and I can't fix that.
As you find some of these problems, message me, and I'll see if I can fix broken links on this site, or recover from other sources. It's not going to happen all at once as I have a life of my own to live. I have fixed quite a number in the past. Maybe more in the future.