2
Some old instruction for XOOPS 2.02 said:
Quote:
Upgrade from XOOPS 1.3.x
1. Download the full package, unpack it and upload all files included (some files will be overwritten).
2. Point your browser to /install/index.php to start the installer. The installer will automatically detect your 1.3.x and upgrade to 2.0.1. Please read docs/INSTALL.html for details on installation
I don't have access to 2.0.1, but maybe you can try
2.0.13, and see if it can upgrade your version to 2.0.13. If it works, then you can should be able to upgrade to XOOPS 2.5.6.
Of course, do the tests locally to see if it works, and NOT on your production site!!!
Let us know if it worked!