Hi again,
Have now fixed the issue, which was very serious, since it affects anyone who has a different region on their phone than the application is made for! Like yourself, who probably have bought it from on of the supported regions. But the application should of course run fine on your device even if we do not have dutch texts in the program, you should just get the english texts.
Since this can affect several people, I have not sent you the file "privately", but made it public for all to download.
I have made a "tempfix" and have put the CAB (=installationfile) available for anyone here:
http://www.trineseries.com/cabs/TDF.CABThis "temporary-open-to-all" version will stop working 1. June 2010 (will refuse to startup after this date), but by that time the update will be available on Marketplace (I will send in to Microsoft during the day)
Download and use it in the meantime...so you get what you actually paid for!

If you never have used a CAB before, let me know here, and I will explain how you can install it.
Great if you also would confirm that it works for you now...I have tested on my phone now, with dutch region, but always good to get a confirmation from the one who actually had the problem too!