3
The archive contains replacement files. You can not use these to replacer the higher version 2.4.0 ones.
The archive contains the old original files. Use them to compare and identify the changes in the replacement files. Now repeat these modifications at the same places in the current XOOPS files using the info on the lines before and after the hack.
There are only 10 files to do and DuGris seems to have start and end comments on the hacks, so, it should not to be that difficult.