I've tried both of those ways and each gives the error. Is there a link to a older version of the tool? Maybe this version is giving me trouble. If you have an older version could you send it to nytekat1@gmail.com?
There are lots of people who use it without a problem, so I can only guess it is something with the environment it is running in. You could try uninstalling and reinstalling; you could download VersionCheck (
http://www.tmgdevelopment.co.uk/versioncheck.zip) for the .NET framework and make sure it is OK; you can also, (though drastic) un- and re-install the game. You could also extract a 2DA file, open it from disk and verify the error occurs, then send me that file to the address in the readme.txt file.
As for prior Kotor Tool releases, I don't maintain an archive. Sorry!