This post did not start too well as I spent 15 minutes trying to find out where to login. Tried to post ,(thinking I would get a login page, no way jose) but was returned to the forum.
The only login mod I could find was at the bottom right of the Home Page.

The reason I am posting is I cannot find an upgrade from 2.3.3 to 2.4.1.

I cannot find an upgrade guide in documentation or a Search.

Curious to know if I am supposed to install a new version as the download page only has the full installation, or whether I can simply overwrite the files with the new version.

I have rewritten various files in the existing installation and have done quite a lot with the templates.

Reading a few posts on the forum I see various upgrading issues but still cannot find a definitive guide.

Is there one?

Thanks in Advance.

I did not find any "upgraded package" from Sourceforge for 2.3.3. to 2.4.x.
I just used that full install to upgrade my XOOPS (2.3.3b to 2.4.0).
And follow the instruction described for the "upgrade package" with the full install one.

Thanks for the reply.
I did find a 2.3.3b upgrade package.
The upgrade instructions are in the release notes file.
Not sure that I can use this package for the 2.3.3 install I have so will leave it for now. Probably will not bother upgrading as nothing is too clear.

... isn't this the upgrade you're looking for? Alternatively, use the regular 2.4.1 package and follow the instructions in the readme/