Re: Trying to use old DB with fresh install
I'm a little confused about why you want so desperately to use the old DB. Sure, it will contain some things that affect the site template and functionality, some admin settings and perhaps some SQL setups required by old mods. But...
Some of those old mods, perhaps all of them if the site was that old, will not work in the latest ZC. And you'll have to get those old SQL-inserted changes out of the old DB.
The admin settings are easy to replicate; just go into the old admin and make notes. (Many of us use screen captures of the admin screens in such a case.)
One of the best things you can do to a really old site when upgrading is... don't upgrade. Update instead. Update the whole site, adding new mods as needed and even adding a new template. It seems a little more work at first, but compared to what you're trying to do it may be less work.
Breakfast: the most important donut of the day.