Hang in there Fred. I've had to do the technology hopscotch thing for the past 10 - 15 or so years. Started 3 Wides Picture Vault in 2002 using Microsoft's Front Page 1998 website builder program. Was probably using Windows Milenium back then. Was able to get my hands on a copy of Frontpage 2003 that allowed me to limp along for a while. Every time Windows makes you get a new version (Windows 7, Windows 10).... I had to cross my fingers and see if Frontpage would still work, since it was discontinued by Microsoft many, many years ago.
The even bigger problem is when the servers that are hosting a website no longer support whatever platform the website was created in (they say that they can no longer get the security patches needed to host problem free which is code for, "we're making what you do obsolete so that you have to buy/do something totally different), so they give you a cut off date where they will no longer host the site on it's current platfform.
I was very fortunate (with the help of Jay Dugan) to move the site to GoDaddy's servers about 2 years ago. It's still all what I created, and still in Frontpage, but they (so far) have found a way to host it (make it available for folks to view) without issue.
After 18 years, I don't have the patience to try to recreate the entire "3 Wide's Picture Vault" in a new web building program, so we'll keep the lights on as long as they can keep hosting it in the format that it was built!.
Sounds like you were able to migrate your stuff from one platform to a new one, so hopefully it'll all work out. Because of the age, and the amount off pages/files on the main site (3 Wide's Picture Vault), there's no easy/possible way to migrate to something else, so we'll just keep at it until somebody says we can't anymore!