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I would have taken a look at the custom_filter_text.zip.
See that there are four files...
Would have taken the four files from the appropriate original XOOPS distribution (2.0.5.2, 2.0.6 or whatever version I have installed), and would have uploaded the appropriate four files to my site.
Would have hoped that this work.
Maybe, before installing the custom_filter_text.zip I would have recognized that this is for XOOPS 1.3.x, and that the custom_filter_text.zip is maybe not suitable for XOOPS 2.0.x.
But as I see..... I'm too late