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normally it makes no different, if I make a new module.
The only problem I see is, that it is not possible to update from xNewsletter to xnewsletter, because the system does not find the "old" path (with uppercase).
I know no simple way - only uninstall and reinstall, but than all data are lost.
Or I dump the tables of the module, and also all data of other tables like config, if there are data inside. If you reinsert the data later, you have to take care, that you have the right module id in the tables.
This is not the simple way of updating a module as usual in xoops ;-(
Maybe someone else know a simple way, but if there is no easy way we should let uppercase for the older modules
