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Alain, I have uploaded the file "xoops2.5.6-to-2.5.7.zip"
You can use it to upgrade existing XOOPS 2.5.6 installation to XOOPS 2.5.7. Just follow the instructions in the file:
README_UPGRADE_TO_2.5.7.txt
If you have older versions than 2.5.6, you can either upgrade one by one to XOOPS 2.5.6 (which people have done already, since 2.5.6 is already for colse to 1 year around), or you can copy all files from XOOPS 2.5.7, and then run:
/upgrade
/update of System, PM, Profile, and Protector modules
Let me know if the instructions in the document are clear enough...