Hello juniper545
Which version of Morrowind are you using? If it is the Steam version, then the version used MUST always be in the original Morrowind folder
(but parallel installations can be achieved quite quickly by renaming or moving).
Also, for Steam the MorowindCodePatch must be installed in your version of Arktwend, as the Steam files are newer than the mod files and therefore the older files are ignored (the code patch changes this automatically, but an older version may be even better, as the very latest one is known for other incorrect settings).
In the case of installation errors, it is important to delete the remains of files from the folders after uninstallation before a possible reinstallation so that there are no complications later (only save your game saves if they are not also defective).
Regarding third-party mods: unfortunately we cannot provide support for mods that were not created by us, this would have to be done by the respective creators, TAO is such a mod. Often you can still find the creators via NexusMod's, but understandably not always, especially if the mods are quite old.
Try an installation without any other mods (also keep in mind that SureAI only created the German versions of MyarAranath and Arktwend, the rest is the work of the community).