Other than maybe 7z which I suspect is 7zip? although I have no sign of it in my Microdem install here, I don't think any of those are any use for Trainz purposes.
I've never updated just downloaded the latest download and replaced the previous as this program is constantly in Beta, I stick to what's on the download site, you may have hit a bad update.
I suspect the dbf files are tiny so would download quickly.
Just checked the Microdem forum, it is 7zip and it is missing he's put up links to download the missing files however I'd go back to the one you downloaded until the author puts up a new version.
I've never updated just downloaded the latest download and replaced the previous as this program is constantly in Beta, I stick to what's on the download site, you may have hit a bad update.
I suspect the dbf files are tiny so would download quickly.
Just checked the Microdem forum, it is 7zip and it is missing he's put up links to download the missing files however I'd go back to the one you downloaded until the author puts up a new version.