Deployment
An application that checks spelling on your development machine can fail on the machine of a user, because TX Spell .NET finds its language data in the installation directory on your machine but only next to the application elsewhere. The problems below start from how the application was deployed. The messages about missing folders are explained on Dictionaries Not Found.
Spell Checking Works on Your Machine Only
On the target machine, TX Spell .NET reports that a folder of its language data is missing, for example:
Neither a Dictionaries directory was found inside the application's executable program file folder, nor a valid TXSpell registry key referring to the corresponding default directory could be detected.
On a development machine, TX Spell .NET finds the language data in the \Assembly subdirectory of its installation. On any other machine, it looks only in the folder of the application's executable, so the assemblies and the four language data folders, with the dictionaries you added, have to be shipped there. Deploying .NET Framework Applications lists the files and explains why the build output isn't enough.
A Published Application Misses Files
An application that you published with Visual Studio fails on the target machine.
The NuGet packages copy the required files, including the four folders, into the publish folder, but together with TX Text Control, the application needs a target runtime. Publish to a folder, set the Target runtime to win-x64 when the application uses TX Text Control, and deploy the complete content of the publish folder, as Publishing .NET Applications shows.
The Dialogs Aren't in the User's Language
The spell check dialog and the options dialog are shown in English on a machine with another language.
The texts of the dialogs are built in for English and German, and the German texts are in the subfolder de, which has to be deployed. Other languages need a satellite assembly built with the Resource Kit, which is loaded only when the language of the system matches. Localization and Resource Kit shows how to deploy the German texts and build other languages.