@dbell154 wrote earlier:

I tried to move/upgrade b2e with a different domain, but it fails and error links point to the old domain.

You must make sure that your Domain Name System (DNS) settings -- usually at your domain name provider -- is pointing at the proper IP abc,def.xyz,stu for your b2evolution resource; also you must allow at least 24 hours after the update/modification/change to propagate.

Make sure this file
b2evolution/conf/_basic_config.php

references same domain your DNS is pointing at:
$baseurl = 'http://localhost/b2evolution/blogs/';

If you still are having issues comment the above directive as:
/*
$baseurl = 'http://localhost/b2evolution/blogs/';
**/

AND ucomment the subsequent section by removing characters / and /
// Use the following if you want to use the current domain:
/ <==remove this
if( isset($_SERVER['HTTP_HOST']) )
{ // This only works if HOST is provided by webserver (i-e DOES NOT WORK IN PHP CLI MODE)
$baseurl = ( (isset($_SERVER['HTTPS']) && ( $_SERVER['HTTPS'] != 'off' ) ) ?'https://':'http://')
.$_SERVER['HTTP_HOST'].'/';
}
and remove this other ==>/

To allow b2evolution to automatically detect your domain.

Good luck!

The DNS wasn't an issue in my case since it's an existing/running site.

It turns out that moving to a new site was as simple as editing conf/_basic_config.php. Apparently the one thing I failed to do after editing was to upload it to the server. :)