Upgrade from 5.1.6 to 9

[Jake Savin]

On Wednesday, October 16, 2002, at 07:31 AM, Eric Soroos wrote:

> At some point in the past there was a slight change in the db format 
> (6.1 era) that _may_ make it a one way trip for your databases. New 
> versions will open old roots, but I can't be 100% sure of the reverse. 
> I'm pretty sure that you can drop an frontier9 app into the frontier 5 
> folder and start everything up if you have to. But I'd rather have the 
> backups.

If I recall correctly, the database file format *did* change around 
6.x, though I'm not sure exactly what version. It's also true that 
newer versions of the Frontier app will open older databases, but the 
reverse is probably not true. This is from memory n-grams encoded 
before I started working at UserLand, but I'm pretty sure this is the 
case.

Regardless, Eric's right -- make sure you back up your entire Frontier 
installation before attempting to upgrade.

-Jake