Hi folks,
I have a D6.9 site that I need to upgrade, so here is what I did.
It was part of a multisite install and I first wanted to split it out into a sandbox site as a stand-alone install. So I used some instructions I found on this site for copying a site, and that worked well. Basically I took all of /my/path/drupal-6.9 and copied it to /my/path/example.com, then I went into /my/path/example.com/sites and removed all the sites except the one I wanted. I renamed it to sandbox.example.com and updated the other things as per the article I found. e.g settings file, made copy of DB, and made a new apache config file for sandbox.example.com
So I had a stand-alone installation but it was using the sites directory in this probably unusual fashion.
And it worked great.
Then I went through the upgrade for 6.9 to 6.26. Followed the instructions to the tee and it went well. First updated the core, then my extra modules cck, path_redirect, and fckeditor. fckeditor did have an issue because I could not find a place where to download the latest version of fckeditor as per the instructions, so I just copied it from the 6.9 install. Though I did upgrade the D6 middleware code if you get what I mean.
Anyway, that all seemed to work fine too and the sandbox site was chugging along nicely.