Clean install but migration posts and users
I experience various issues with the upgrade to 3.1 version. I believe that has something to do with my previous update to 2.8 release, I notice that the forum didn't even support the new friendly URLs. When I upgrade it, if I remember correct from 2.6 or 2.4, I didn't know exactly what are the new features, so I didn't notice that I use the old URL system.
The routes system isn't working also. My config.php, I believe, is very old. Generally, I don't know how to handle all that mess.
So I thought maybe it is better to install a clean 3.1 and migrate my post, users, and why not the theme and some settings.