I believe the confusion is failure to understand the difference between admin and catalog.

As I said, IF it is merely a question of upgrading the admin (which was what I understood from the post), THEN it wouldn't be so hard. Since it touches many core files related to the catalog then fair enough, it is not simple.

Still I repeat my main question which is 1.5 unrelated:

How to make SSU work, in the same version (1.3.9h) if I change the name of the catalog folder?

I've tried reinstalling it by uploading the files and it still doesn't work, all the links keep returning to the homepage. Do I need to change something to reflect the new folder name?

If anyone uses SSU and works in a development folder instead of reflecting the changes immediatly in the live site you will be able to help me. I am working in a dev folder and if SSU is enabled every link keeps returning to the homepage. Thanks in advance!