You use XOOPS 2.5.10 and you would like to use the xSwatch4 theme which is compatible only from XOOPS 2.5.11, a version still in development.

The monxoops.fr team had already worked on it by proposing a xswatxh4-enabled version, compatible with XOOPS 2.5.10.

Since, many contributions, functionalities and corrections were brought.

monxoops.fr continued its effort by proposing the version 2 of the theme xswatch4-ebabled.

You will know everything by reading the full article on monxoops.fr, in english, then go for it!